MP-133 - pump-action shotgun from Izhevsk gunsmiths

The Izhevsk Mechanical Plant produces a rather impressive list of various weapons. In particular, Izhevsk gunsmiths have long and successfully launched the production of a whole series of MR guns (previously this series was called IZH) with different characteristics and for different purposes. However, in addition to traditional smooth-bore hunting and sporting rifles, gunsmiths from Izhevsk also produce products that can be called non-traditional. In this case we are talking about the MP-133 pump-action smoothbore shotgun.

Total information

Multi-shot hunting shotguns MP-133, MP-153 are designed for various types of hunting, sports, for self-defense of citizens and protection of their property, in all climatic conditions at any time of the year at ambient temperatures from minus 30 to plus 50 ° C.

FSUE "Izhevsk Mechanical Plant" produces guns of the following versions:

Depending on the length of the chamber, the MP-133 and MP-153 guns can have two versions - with a chamber length of 76 or 89 mm;

Depending on the design and size of the choke constriction, the MP-133 and MP-153 shotguns can have three versions - with a constant choke constriction and with replaceable choke constrictions for lead or steel shot;

According to the design and material of the gun stock, guns can have a wooden butt and fore-end, a plastic butt and fore-end, a plastic folding butt and fore-end, a forend and a pistol grip instead of a butt;

In terms of the design of the sighting devices, guns may differ in the presence of a rail, the installation of a front sight without a rail, the installation of a front sight with a rear sight without a rail, and the presence of seats for mounting a collimator or optical sight.

Depending on the barrel nut design, the shotgun magazine can hold 4, 5, 6, or 8 rounds of 12/76 caliber ammunition.

MP-133 shotguns are manufactured with a barrel length from 500 to 750 mm, MP-153 shotguns - from 610 to 750 mm. Some guns can be equipped with barrels with a wide rib (10 mm) and compensating holes to reduce the recoil of the gun when fired. The operation of the reloading mechanisms for MP-133 shotguns is carried out manually due to the energy of the shooter, for MP-153 shotguns automatically due to the energy of the powder gases diverted from the barrel bore into the gas chamber.

Brief history of creation

It all started back in 1993, when a group of Izhevsk engineers led by S.G. Antonova presented her new development - a smooth-bore shotgun IZH 81 with a sliding fore-end, or, as people say, with pump-action reloading. Times were hard - it was the wild 90s, there was not enough funding, so mass production of the new product began only towards the middle of 1994.

The model was sold on the arms market until 2000, having managed to become the most popular weapon of security companies in the Russian Federation. By this time, the Izhevsk plant had prepared a replacement for the “eighty-first” - the legendary MP 133. The shotgun differs from its predecessor in size, weight and some details. The principle of operation has remained virtually unchanged.

MP 133 with pistol grip

Marking of guns

The location of the markings is shown in Fig. 1

Specifications. The main parameters and their meaning are given in Table 1.

Notes:

*The designation and nominal values ​​of interchangeable choke constrictions are given in Table 2.

**A distinctive feature of the gun with a larger magazine capacity is that this gun uses an increased barrel nut.

Table 2.

Section 2.

MAINTENANCE

Analogues and competitors

Now the MP 133 model has been discontinued and is not supplied to gun store shelves. If we consider new products, then among domestic analogues this is the MP 135, which replaced the 133rd in 2013. Imported analogues are Mossberg 590 and Remington 870.

Interesting to know: starting from 2013 to the present day, a modernized version of the legendary Izhevsk carbine - MP 135 - has been sold on the smooth-bore hunting weapon market. The model is distinguished by improved material of some parts, a modernized shock absorber on the butt and other little things. The gun has the ability to adjust the butt bends using special inserts.

Design and principle of operation of the MP-153 shotgun

The MP-153 self-loading hunting shotgun consists of the following main components:

— a barrel with a gas chamber and a regulator for the rollback speed of moving parts;

— boxes with an under-barrel magazine and an interceptor;

— a movable system of the gun, which includes a piston, a rod assembly (bolt frame), a wedge, a bolt with a reloading handle;

— return spring;

— trigger mechanism (trigger mechanism);

- butt;

- handguard.

To increase corrosion resistance, the bore and chamber of the barrel, as well as gas engine parts (piston, gas chamber), are chrome-plated, and the valve is made of stainless steel. The operation of the gun's reloading mechanism is carried out automatically due to the energy of the powder gases discharged through holes in the barrel wall into a gas engine located on the barrel, as well as due to the energy of the return spring located on the magazine tube.

The speed regulator for the recoil of moving parts is mounted in the gas chamber and consists of valve 6, valve spring 5 and chamber nut 4. The speed regulator allows the use of cartridges with different characteristics, as well as compensate for the influence of the temperature conditions of the gun - by releasing excess pressure of powder gases from the chamber in atmosphere. The bolt is longitudinally sliding, the barrel is locked by the lug lug of a wedge located in the bolt and raised to the extreme forward position using a rod. The wedge's lug fits into the corresponding recess in the barrel coupling.

The trigger mechanism is mounted on a separate base and allows only single shots. The gun has a push-button safety located in the trigger mechanism housing (Figure). The gun has a mechanism to delay the bolt in the rear position when the cartridges are used up.

The mechanisms of the gun work as follows:

- when you press the trigger, the sear rotates on its axis and releases the trigger, which strikes the firing pin, and with its lower tooth moves the holder, thereby releasing the interceptor;

— when firing a shot under the influence of powder gases, the piston with thrust begins to move backwards and the barrel bore is unlocked due to the action of thrust on the wedge; subsequently there is a joint rollback of the entire moving system: piston, rod (bolt frame), bolt with wedge;

— at the same time, the cartridge is fed from the magazine to the tray;

— when the recoil parts move backward, the cartridge case is removed from the chamber, the cartridge case is removed outside the box, and the hammer is cocked;

- when the moving system moves forward, under the action of the return spring, the tray with the cartridge is lifted, due to the interaction of the earring with the recess on the bolt frame, and the cartridge is sent into the chamber;

- when the bolt comes to the forward position, the barrel bore is locked by lifting the wedge into the coupling recess due to the additional movement of the rod with the piston forward. The gun is ready for the next shot;

- when the cartridges in the magazine are used up, after the last cartridge is fired, the interceptor, opening access from the magazine tube, closes the tray, the bolt frame rests with a recess on the earring and stops in the rear position.

Characteristics of a pump-action shotgun

A pump-action weapon is a weapon of a special design, therefore its characteristics in some cases can be quite specific:

• This gun is considered quite reliable and, moreover, easy to use;
• Due to the design features, the process of reloading the gun was quite noisy, so it was impossible to hunt with such a gun in places where the strictest silence was required;
• The chamber length of the gun is of three varieties: 70 mm, 76 mm, 89 mm;
• The gun has only one caliber - 12 mm, so the gun was not suitable for those hunters who wanted to hunt with ammunition of other calibers;
• When shooting, the gun experiences very strong recoil. Especially for a model with a folding stock;
• This gun has one unique design feature. No other pump-action shotgun in the world has this feature. The gun is equipped with a special bolt delay, which helps remove the charge from the chamber and prevents the next charge from being sent into the chamber. Due to this feature, the gun can be safely transported when loaded;
• Many users claim that the MR handguard is inconvenient because it is a bit short and, moreover, is located far from the receiver. It is not always possible to reach it without problems, especially during winter hunting when the shooter is wearing warm clothes;
• The accuracy of the gun's fire never caused any particular complaints;
• The weapon's trigger is equipped with three blocking modes: when the bolt is not fully closed, the gun cannot fire; when a charge enters the chamber, the forend is blocked, and, in addition, the trigger is also blocked by a mechanical lever;
• The gun was always equipped with replaceable muzzle constrictions; the barrel could be equipped with a muffler and a compensator brake;
• The gun can fire shot of different sizes, as well as bullets of a suitable caliber.

The distance at which an effective shot from a gun can be fired is 50 meters.

The design and principle of operation of the MP-133 shotgun

The MP-133 multi-shot hunting shotgun consists of the following main components:

- barrel with coupling;

— boxes with an under-barrel magazine and an interceptor;

— a movable system of the gun, which includes the forend assembly, the bolt assembly with the wedge;

— trigger mechanism (trigger mechanism);

- butt.

To increase corrosion resistance, the bore and chamber of the barrel are chrome-plated.

The design and operating principle of the mechanisms of the MP-133 and MP-153 shotguns are largely similar. The difference is that the operation of the reloading mechanism of the MP-133 shotgun is carried out by moving the forend to extreme positions with the hands of the shooter. In this regard, in the trigger mechanism of the MP-133 gun, the delay plays the role of delaying the moving parts in the forward position until the shot and the disconnector are fired, and in the trigger mechanism of the MP-153 gun, only the disconnector, which allows you to fire only single shots. Due to the higher speeds of the moving parts on the MP-153 shotgun, the cartridge is fed to the tray at the moment of the shot (from the actuation of the holder). In the trigger mechanism of the MP-133 shotgun, this part is absent and the operation of the reloading mechanism is determined by the movement of the rod.

The mechanisms of the gun work as follows:

- when you press the trigger, the sear rotates on its axis and releases the trigger, which strikes the firing pin, and with its delay pin frees the fore-end to move backwards;

— when the forearm moves backward, the cartridge case (or cartridge) is removed from the chamber, the cartridge case is removed outside the box, and the hammer is cocked. In this case, the thrust releases the interceptor and the cartridge is supplied to the tray. When the hammer is cocked, the handguard can be moved back by pressing the delay button up;

— when the forend moves forward, the tray with the cartridge is raised, due to the interaction of the earring with the recess on the bolt frame, and the cartridge is sent into the chamber;

— when the bolt comes to the forward position, the barrel bore is locked by lifting the wedge into the coupling recess due to the additional movement of the forend with traction. The gun is ready for the next shot;

- when the cartridges in the magazine are used up, after the last cartridge is fired, the interceptor, opening access from the magazine tube, closes the tray, the bolt frame rests with a recess on the earring and stops in the rear position.

Proper handling and timely maintenance increases the service life and guarantees reliable operation of the gun. If this is not necessary, you should not completely disassemble the gun.

Pros and cons of the model

MP 133 has all the advantages of carbines with a pump-action reloading system. This is a high rate of fire, comparable to the rate of fire of semi-automatic weapons, high resource and durability. Moreover, the device has a simpler design and lighter weight than a semi-automatic device.

Jerking the forend without looking, or “automatically,” allows the shooter to look around for at least a split second and assess the situation and choose another target. The ability to use a wide variety of cartridges is also a big advantage.

The disadvantages of the design are the need to re-search for the target and aim after reloading and the need to empty the magazine to change cartridges.

Interesting to know: the reloading scheme with a sliding fore-end is widely used not only in hunting rifles and carbines. Pump-action charging is implemented in grenade launchers, for example EX 41, as well as in airsoft and pneumatic weapons. There, the movement of the forend cocks the spring or compresses the air.

Advantages and disadvantages through the eyes of real owners

Among amateur hunters, the MP 133 is considered a reliable working carbine. It is reliable, unpretentious to the quality of cartridges, and has good grip and balance. With proper care and compliance with operating rules, the product works like a clock and does not cause problems.

The 133rd has almost no serious shortcomings. Especially if, as in the old Soviet joke, the product is “carefully processed with a file,” that is, disassembled, lubricated, and removed roughness and burrs. New guns sometimes have problems with the cartridge leaving the magazine. The issue can be resolved by overhauling and lubricating the assembly.

Design disadvantages - fragile varnish coating of wooden parts - butt and forearm. They are easily scratched by sharp objects and quickly lose their appearance. Some owners note an inconveniently located front sight, and small hunters complain about the far-placed fore-end, which makes it awkward to shoot offhand.

Review of the MP 133 pump-action shotgun

The procedure for partial disassembly of the MP-153 shotgun

To ensure the necessary care (cleaning, lubrication, inspection), the gun is partially disassembled (see figure):

1. Unscrew the barrel nut 7.

ATTENTION! In the version of the gun with an increased magazine capacity (with an extension nut 11), there is no cup 14 and when unscrewing the barrel nut it is necessary to hold it to prevent the magazine spring 15 from flying out.

2. Remove the handguard 75.

3. Move the bolt back using the handle 10...20 mm and separate the barrel from the box.

4. Remove the charging handle, pulling it out with some force in a direction perpendicular to the bolt axis.

5. Remove piston 20, rod 23, bolt 30 with wedge 41, return spring 21, ring 22 from the gun.

6. Remove the trigger by knocking out two pins 67 from the box that hold the base of the trigger in the box.

The procedure for completely disassembling the MP-153 shotgun

1. Carry out partial disassembly of the gun.

2. Separate the butt 79; to do this, unscrew the screws 81, separate the butt plate-shock absorber 80 and unscrew the butt clamping screw 82.

3. Disassemble the trigger. To do this you need to do the following:

— remove holder 68 with spring 69;

— release the trigger, holding the trigger with your finger to avoid impact in the extreme forward position;

— use a hammer to knock out the trigger axis 56, the sear axis 50, the trigger axis 84, the axis with the ring 66;

— knock out the fuse pin 46 and separate the fuse 43.

4. Disassemble the shutter, for which you need to:

— knock out the axis 37 of the striker;

— remove the hammer 40, spring 39 and washer 38, holding the wedge in place;

— separate the wedge 41 down, taking measures to prevent the ball from being lost;

ATTENTION! When the wedge is separated from the bolt, ball 25 is released, which is located in the wedge groove on the right.

— knock out axles 37 of the extractor and ejector;

ATTENTION! The axes of the extractor and ejector are knocked out only from the bottom up.

- separate the ejector 36, ejector bend 34, ejector spring 35, extractor 31, extractor bend 33 and extractor spring 32.

5. Knock out the axis of interceptor 72 and remove interceptor 70 with spring 71, interceptor button 73 and interceptor button spring 74.

6 To remove the spring of the tubular magazine 15 and the feeder 16, by pressing the protrusions of the plastic cup 14 through the side holes in the magazine tube, push the cup inside the tube flush with its front end and, turning it around its axis at a certain angle, remove the cup, holding it from flying out under the force magazine springs.

7. Disassemble (if necessary) the rollback speed regulator of the moving parts.

ATTENTION! Disassembling the speed controller is not recommended.

Due to the large force of pre-compression of the valve spring, disassembling the speed regulator should be done only in a service station in order to determine the reasons for the weak rollback of the moving parts, if necessary, adjust the pre-tension force of the valve spring or when replacing parts if they break.

Assembly procedure for the MP-153 shotgun

Reassembling the gun is done in the reverse order.

After complete disassembly:

1. The tubular magazine is assembled.

2. The interceptor is installed in the box.

ATTENTION! The axis of the interceptor, to prevent it from shifting when firing, must be cored along the contour of the box hole from below.

3. The shutter is assembled, for which it is necessary:

— assemble the extractor and ejector with the shutter;

— place the wedge in the bolt as shown in the figure, lowering it down until a groove appears in the bolt;

— place ball 6 into the groove in the wedge and lift the wedge up;

— insert washer 4 into the rear groove of the wedge;

— place firing pin 3 with firing pin spring 5 in the bolt, stitching the washer;

— hammer in the hammer axis 7.

4. The trigger mechanism is assembled.

ATTENTION! The sear axis, to prevent it from shifting when firing, must be cored along the contour of the hole in the base of the trigger on both sides. It is more convenient to install the holder with the hammer cocked.

5. The butt and butt plate are installed. The connection of the butt to the box must be strong, without rolling.

After partial disassembly:

1. Install ring 22 on the magazine tube with the annular groove forward and a return spring.

2. The moving parts are installed on the gun. When installing moving parts on a gun, the bolt with wedge, rod and piston must be assembled into one unit. Make sure that the rod is connected correctly to the piston; the protrusions of the rod should fit into the corresponding grooves of the piston. In this position, the bolt with a wedge and rod are inserted into the box, and the piston is simultaneously inserted into the magazine tube.

Before moving the bolt into the box, you should pay attention to whether the ledges of the ring 22 on the magazine tube are located correctly and whether it does not interfere with the advancement of the rod. It is more convenient to insert the bolt with a wedge and a rod into the box in a horizontal position of the gun; in this case, the bolt must be moved forward and the wedge lowered so that it does not interfere with the movement of the bolt into the box.

3. After installing the bolt into the box (before installing the barrel), it is necessary to install the bolt reloading handle.

4. Install the barrel into the box. In this case it is necessary:

— move the shutter back approximately half the stroke;

— insert the barrel into the box;

— release the bolt to the forward position, holding the barrel.

5. Install the handguard.

6. Tighten the barrel nut.

ATTENTION! Check for free movement in the bolt and the return of the firing pin under the action of the spring after pressing it with your finger.

7. Install the trigger, in this case it is necessary:

— move the bolt back and, pressing the interceptor button, carefully move the bolt to the forward position;

— cock 55;

— install the trigger.

When assembling a gun, it is not recommended to use great force or forcefully hammer in moving and removable parts in order to avoid nicks, scratches, and crushing of the contacting surfaces of parts.

Reviews, opinions, comments

For the most part, reviews about the gun are quite positive. Experts, as well as gun owners, note that the gun has at least several positive characteristics. Thanks to these characteristics, the MP-133, despite the fact that it is no longer mass-produced, still has a fairly stable demand.



The main advantages of the gun are its reliability, simplicity of design, multiple charges and cost. On average, its price is just over 14 thousand rubles, which, compared to the cost of many other models, is truly something that can be called a pleasant surprise. In addition, the gun is also valued because if it is properly cared for, it will not fail even when the gun is several years old. Another undoubted advantage of this weapon is that you can equally successfully shoot branded charges and homemade charges, as well as different types of shot.

For all these reasons, the gun is valued not only by hunters. Many Russian private security guards are armed with them. Truck drivers eagerly take this gun with them on trips (especially models with a folding stock and sawn-off shotguns). Many people buy this gun to protect themselves, as well as their loved ones and their property. Here, too, for obvious reasons, models without a stock and with a folding stock are especially respected.

The procedure for partial disassembly of the MP-133 shotgun

ATTENTION! In the version of the gun with an increased magazine capacity (with an extension nut there is no cup 11 and when unscrewing the barrel nut it is necessary to hold it to prevent the magazine spring 12 from flying out;

1. Unscrew the barrel nut 4.

2. Move the forend back half the stroke length and separate the barrel from the box.

3. Carefully moving the forend forward, remove the bolt with the wedge.

4. Remove the trigger by knocking out two pins 61 from the box that hold the base of the trigger in the box.

Purpose and scope of application MP 133

The carbine is intended primarily for amateur and commercial hunting. It is very popular in law enforcement and security services. Often purchased by citizens for self-defense. In a number of countries, for example Kazakhstan, it is certified as a weapon of security structures.

It’s interesting to know: by the time the first Russian shotgun with pump-action reloading appeared in the West, such weapons had been in production for a long time and were extremely popular. It was invented by the American engineer Christopher Spencer in 1882. This architecture has a number of advantages - recharging speed, reliability and simplicity.

The procedure for completely disassembling the MP-133 shotgun

1. Carry out partial disassembly of the gun.

2. Separate the butt 67; to do this, you need to unscrew the screws 69, separate the butt plate-shock absorber 68 and unscrew the butt clamping screw 70;

3. Disassemble the trigger in the following sequence:

— release the trigger, holding the trigger with your finger to avoid impact in the extreme forward position;

— use a hammer to knock out the trigger axis 51, sear 45, trigger 45, delay 60;

— knock out the fuse pin 41 and separate the fuse 38.

4. Disassemble the shutter, for which you need to:

— knock out the axis 32 of the striker;

— remove the hammer 35, spring 34 and washer 33;

ATTENTION! When the wedge is separated from the bolt, ball 73 is released, which is located in the wedge groove on the right.

— separate the wedge 36 down, taking measures to prevent the ball from being lost;

ATTENTION! The axes of the extractor and ejector are knocked out only from the bottom up.

— knock out axles 32 of the extractor and ejector;

- separate the ejector 31, ejector bend 29, ejector spring 30, extractor 26, extractor bend 28 and extractor spring 27.

5. Knock out the axis of interceptor 64 and remove interceptor 62 with spring 63, interceptor button 65 and interceptor button spring 66.

6. To remove the spring of the tubular magazine 12 and the feeder 13, by pressing the protrusions of the plastic cup 11 through the side holes in the magazine tube, push the cup inside the tube flush with its front end and, turning it around its axis at a certain angle, remove the cup, holding it from flying out under by the action of the magazine spring.

Assembly procedure for the MP-133 shotgun

Reassembling the gun is done in the reverse order.

After complete disassembly:

1. The tubular magazine is assembled.

2. The interceptor is installed in the box.

ATTENTION! The axis of the interceptor, to prevent it from shifting when firing, must be cored along the contour of the box hole from below.

3. The shutter is assembled, for which it is necessary:

— assemble the extractor and ejector with the shutter;

— place the wedge in the bolt as shown in the figure, lowering it down until a groove appears in the bolt;

— place ball 6 into the groove in the wedge and lift the wedge up;

— insert washer 4 into the rear groove of the wedge;

— place firing pin 3 with firing pin spring 5 in the bolt, stitching the washer;

— drive the hammer axis 7;

4. The trigger mechanism is assembled.

ATTENTION! The sear axis, to prevent it from shifting when firing, must be cored along the contour of the hole in the base of the trigger on both sides.

5. The butt and butt plate are installed. The connection of the butt to the box must be strong, without rolling.

After partial disassembly:

1. The moving parts are installed on the gun. When installing moving parts on a gun, the bolt with wedge and the forend assembly must be assembled into one unit. In this position, the bolt with the wedge and the bolt frame are inserted into the box, and the forend is simultaneously inserted onto the magazine tube.

It is more convenient to insert the bolt with a wedge and bolt frame into the box in a horizontal position of the gun, while the wedge should be lowered and not interfere with the movement of the bolt back;

2. Install the barrel into the box. In this case it is necessary:

— move the forend back about half the stroke;

— insert the barrel into the box;

- tighten the barrel nut;

— move the forend back and press the interceptor button, holding it pressed, carefully move the forend to the forward position;

ATTENTION! Check the free movement in the bolt and the return of the firing pin under the action of the spring after pressing it with your finger;

3. Install the trigger, in this case it is necessary:

— cock the hammer 50;

— install the trigger.

When assembling a gun, it is not recommended to use great force or forcefully hammer in moving and removable parts in order to avoid nicks, scratches, and crushing of the contacting surfaces of parts.

Shotgun MP-133

The MP-133 pump-action multi-shot smoothbore shotgun was developed at the Izhevsk Mechanical Plant, where mass production of this weapon has been established since 2000.

The MP-133 shotgun is intended for hunting, law enforcement and self-defense, as well as sport shooting.
For shooting, cartridges and special ammunition are used, assembled in a 12-gauge case with a case length of 76 or 89 mm. MP-133 with a pistol grip
The MP-133 shotgun was developed on the basis of the IZH-81 shotgun. And on the basis of the MP-133, they created a modification of the MP-133K with a detachable box magazine, which provides a significant acceleration in weapon reloading.

The MP-133 smoothbore shotgun uses manual reloading with a longitudinally sliding fore-end (“pump-action” reloading).

The barrel is locked by a swinging cylinder located in the bolt and, in the firing position, entering a groove in the barrel shank.

The hammer-type trigger mechanism is made in the form of a detachable unit, equipped with a protection system: - from being fired when the bolt is not fully locked; — a lock that prevents involuntary unlocking of the bolt before firing; - non-automatic safety blocking the trigger.

The design provides an anti-kickback switch, which allows you to remove a cartridge chambered into the chamber.

The push-button safety is located on the trigger guard behind the trigger.

The receiver is made of aluminum alloy,

Depending on the purpose, MP-133 shotguns have barrels with lengths from 510 to 750 mm. To protect against corrosion, the bores are chrome-plated. The barrels are equipped with replaceable choke tubes for firing lead and steel shot. The attachment with a reinforced choke (XF) is used for shooting only steel shot. Barrels with lengths of 610, 660, 710 and 750 mm are made with a ventilated aiming rib (by special order it is possible to install a ventilated aiming rib on short barrels).

The weapon is fed with ammunition from an under-barrel tubular magazine with a standard capacity of 4 rounds with a 76 mm long sleeve or 3 rounds with an 89 mm long sleeve. The unit connecting the barrel to the tubular magazine allows you to install a magazine extension and increase the magazine capacity by two cartridges - from 4 to 6, and for the MP-133 model chambered for the 12-gauge cartridge with a sleeve length of 89 mm - from 3 to 5. In the variant MP-133K uses detachable box magazines specially designed for the gun with a capacity of 5 rounds (12/76 mm).

The MP-133 shotguns use a sighting bar or a front sight with a rear sight as sighting devices.
MP-133 with a folding plastic stock.
The stock and fore-end are made of wood (beech or walnut) or plastic. The buttstock is usually equipped with a rubber shock absorber. The version with a plastic stock can have a folding stock from a Kalashnikov assault rifle of the 100 series. There is also a version of the gun without a stock with a pistol grip.

Externally, the MP-133 looks quite elegant, the trigger is rounded, the box is light and has an oval shape, and a comfortable handguard. The gun has a second rod connecting the fore-end and bolt frame, which ensured smoother reloading and reduced fore-end play. An improved detachable trigger mechanism and cartridge feed mechanism provide greater safety when handling the weapon and more reliable operation.

In general, the MP-133 model shotguns are reliable and convenient weapons for hunting and self-defense, which have demonstrated good accuracy and firing range, and also allow the use of the entire line of 12/76 and 12/89 mm cartridges.

Cleaning and Lubrication

The gun should always be cleaned and lightly oiled. For cleaning, use clean wiping material. Clean immediately after shooting or within no more than one day after shooting. In winter, before cleaning, the gun should be kept in a heated room for 2-3 hours.

To clean the bore you need to:

- lubricate the surface of the barrel with gun oil;

— wipe the channel and chamber with cleaning material;

— to completely remove carbon deposits and lead, the process of lubricating and wiping the channel can be repeated several times. To remove heavy lead, you can use a mesh or brush made of thin brass wire, screwed onto a cleaning rod and thickly lubricated with gun grease.

When cleaning shotguns, you should also clean the case and trigger mechanism. The ingress of burning particles of gunpowder between the trigger and the rear axle with the ring on the first batch of guns released from the factory may be the reason for the lack of a shot when the trigger is pressed. When cleaning the MP-153 shotgun, it is necessary to remove carbon deposits from the parts of the gas chamber: from the cavity of the gas chamber, from the piston, from the surface of the magazine tube.

To remove carbon deposits, it is necessary to use gun oil or special liquids to remove carbon deposits. It is not allowed to use abrasive materials or metal objects other than brass mesh to remove carbon deposits. Lubricate the gun parts with a thin layer, especially when operating the gun at subzero temperatures to avoid thickening of the lubricant. The guide grooves for the bolt frame in the gun box must also be lubricated, as well as the outer surface of the under-barrel magazine tube. The parts of the gas engine of the MP-153 shotgun, as well as the tube of the under-barrel magazine in the gas chamber area, should only be wiped after cleaning.

Section 3.

Operating instructions

4.1. The service life and reliability of a gun largely depend on skillful and careful handling of it.

4.2. Do not shoot the gun with primers alone without gunpowder, as the combustion products of the explosive mixture of the primers will damage the bores.

4.3 Do not use cartridges that fit tightly into the chambers: this may make it difficult to remove the spent cartridge case.

4.4 Do not idle the triggers - this reduces the survivability of the firing pins and their springs. If you need to simulate a shot, insert cartridge cases with used primers into the chamber.

4.5 Do not hit the gun barrels as this may cause dents.

4.6 Periodically tighten the screw securing the butt to the frame during shooting, especially during the initial period of operation of the gun, to prevent the butt from rolling.

When disassembling several products at the same time, do not allow the wedge and the bolt to be mixed up - they are not interchangeable.

Section 4.

Read more about the disadvantages of the gun

Despite its relative popularity, the gun, however, has many specific disadvantages, which should be mentioned in more detail:

• One of the main drawbacks is the type of reloading. The gun can only be reloaded with physical effort. However, this feature is inherent in all pump-action shotguns;
• If you shoot shotguns from a gun, the accuracy of fire is small. However, when using a 76 mm sleeve, accuracy becomes much higher;
• When firing, as the magazine is emptied, the balance changes;
• As the forearm moves, the aiming line is disrupted; every time you move the forend, you need to re-establish the aiming line;
• For those shooters who are below average height, it is quite difficult to fire a gun offhand, since it is difficult for them to reach the fore-end with their hand;
• The quality of the gun barrels is not very good, especially the bluing, therefore, having purchased a gun, you need to start tuning it - in particular, additional grinding of the barrels;
• When purchasing a gun, information is attached to it, from which, due to its vagueness and low information content, it is almost impossible to understand anything.

Some of the listed shortcomings can be eliminated by getting used to the features of the weapon, but another part will have to be accepted willy-nilly.

Possible malfunctions and methods of correction

Table 3.

Section 5.

Product repair

ATTENTION! Replacement of the barrel, bolt or wedge is carried out only in the conditions of the head station for the repair of sporting and hunting weapons at the manufacturer. This replacement requires certification tests for strength in accordance with the requirements of the PMC (Permanent International Commission).

Replacing the ejector and extractor

When replacing the ejector and (or) extractor, you must remember that their axes are knocked out only from the bottom to the top. The extractor for the MP-133 gun is made of steel sintered powder billet, and for the MP-153 gun - from rolled steel strip (their strength is different). Installation of the extractor for the MP-133 gun on the MP-153 gun is unacceptable; reverse replacement is possible.

If it is necessary to restore the working edge of the ejector, filing must be done in accordance with the requirements of the drawing. If the requirements cannot be met, the ejector must be replaced.

If replacing the ejector or extractor was caused by their breakdown, it is necessary to inspect the grooves for them on the barrel. There should be no noticeable steps in the extractor groove (closed groove) that could cause the extractor to hit.

Existing steps must be cleaned flush. On guns produced in 2000-2001, a possible cause of ejector failure may be impacts of the ejector on the end of the barrel (the ejector does not fit into the groove on the barrel due to possible play in the bolt). In this case, it is necessary to saw the groove, increasing it up or down by no more than 0.5 mm. After replacing these parts due to their breakdown, it is necessary to check the free movement of the bolt to the extreme forward position on the assembled gun.

It is best to check without a wedge and a return spring (for MP-153), moving the bolt back and forth 10...20 mm from the front position and at the same time turning the forend (for MP-133) or the piston (for MP-153) to the right and left (choosing only gaps and not applying large loads). After installing new parts or attaching the ejector, you must check the dimensions in accordance with the drawing.

Valve spring replacement

Possible malfunctions of the valve spring that appear during operation may be: decreased elasticity, breaks or cracks in the coils. Check the elasticity of the valve spring when disassembling the valve assembly that regulates the rollback speed of the moving parts. The height of the new valve spring when applying a load of 4-M N (45 kgf) should not be less than 18.6 mm for the first group and not less than 19.4 mm for the second group. The height of the chamber nut should be 9-0.1 mm for the first group of springs and 8.6-0.1 mm for the second group of springs. If the spring, when applying a force of 441 N (45 kgf), shrinks to a height of less than 18.6 mm, then the spring should be replaced with a new one. If the groups of the nut and spring do not match, it is necessary to replace the spring or nut with a group corresponding to the group of the other part.

When replacing the spring, it is necessary to screw in the chamber nut until the spring is compressed by an amount that provides a valve preload force of 441N (45 kgf). The position of the chamber nut with the spring installed at the factory is marked by a mark at the chamber slot (barrel post). After replacing the spring, you must mark the new position of the camera nut in the same way.

Replacing the charging handle

When replacing the handle in case of its loss during operation, it is necessary to select a new handle with minimal swing of the handle in the hole of the bolt frame. Pitching with a handle end span of more than 2 mm is unacceptable.

Replacing the forend of the MP-153 shotgun

If the forend breaks, when installing a new one, it is necessary to check the presence of a gap between the rear end of the forend and the front end of the box of at least 0.2 mm. This gap is necessary to eliminate play of the barrel along the axis of the gun, which can cause a new breakage of the forend.

Replacing the stock

When replacing the buttstock in case of its breakdown, it is necessary to check the fit of the front end of the buttstock to the box without tightening it with a tightening screw. A gap between the ends of more than 0.3 mm indicates that when tightening, the load on the butt will be transferred unevenly from the box and the butt may chip during shooting. This is especially true for older shotguns with a long stock bushing. When replacing the stock, you must also replace the long stock bushing with a short one. If it is impossible to replace the stock bushing with a new one, you can correct the position of the bushing with light blows of a copper hammer to avoid loose fit of the stock to the box. However, it will be necessary to trim the clamping screw by mm.

Replacing the striker

If the striker is replaced, it is necessary to check the magnitude of the forced and inertial outputs of the striker. The forced output of the firing pin is measured when the rear ends of the bolt and the firing pin are aligned (when the assembled bolt is placed on the rear end on a flat surface) and its value should be 1.0... 1.4 mm. The inertial output of the firing pin (full) is measured when the firing pin is pressed to the extreme forward position (the firing pin is pinned in the bolt) and its value must be at least 2 mm.

Replacing the tray

After replacing the tray, you need to check the amount of protrusion of the end of the tray above the bottom plane of the box. The protrusion of the tray should be no more than 6 mm, otherwise it is necessary to select a new tray or trigger base. Next, the operation of the interceptor is checked. When you press the retainer button in the direction of the butt, the interceptor, when released, should block the upward movement of the tray. To ensure this requirement, it is allowed to nail down platform A (see Fig.) or platforms B of the tray. In this case, it is preferable to nail down platforms B, not forgetting about the limit on the protrusion of the tray above the box - 6 mm. After ensuring that the interceptor can operate, it is necessary to check the protrusion of the tray above the box when setting the moving parts to the delayed position in the rear position of their movement. The permissible amount of protrusion for this measurement is 2.5...4.0 mm.

The vertical roll of the front end of the tray (tray play) with the trigger pulled and the bolt locked from the bottom position to the stop against the interceptor should be at least 2 mm.

Interceptor replacement

When replacing the interceptor, the first thing to check is that there is no gap between the rear end of the interceptor and the vertical wall of the box (a gap of no more than 0.5 mm is allowed). This check is carried out after placing the new interceptor in the box, and the requirement is ensured by selecting the interceptor button.

After this, the sinking of the front end of the interceptor relative to the generatrix of the hole in the magazine tube is checked. The amount of sinking is not less than 0.3 mm. This requirement must be met by sawing the front end of the interceptor. After satisfying the requirement by filing, it is necessary to blunt the sharp edge of the interceptor, formed during filing, with a radius R of 0.2...0.5 mm.

When attaching the interceptor, it is also necessary to check the protrusion of the interceptor relative to the generatrix of the hole in the magazine tube with the trigger installed. When pressing the tray up, the interceptor rests against the holder, the overlap of the hole should be at least 1.5 mm. After fulfilling all the requirements, it is necessary to check the operation of the feeding mechanism on cooled (dummy) cartridges.

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