Product Information. HK Academy. G28 MSG90 A2. Technical Data. HK - Other. Finally an MG42 armorers repair manual in English! This manual assumes that you have a working knowledge of the MG42, and already know the names of the parts. Only 3 left in stock - order soon. HK P7 in its numerous variants remains a popular carry pistol with those who appreciate its accuracy and low recoil and don't mind the weight, the expense or the unconventional manual of arms.
Sig Sauer P Armorers Manual book. Read reviews from world's largest community for readers. Walther P5. The hammer falls to the firing pin and overcomes the tension of the firing pin spring driving the firing pin into the primer.
The primer detonates, igniting the propellant powder and firing has occurred. When the sear releases the hammer, the spring in the sear cause to travel a predetermined motion. This setting of the sear prevents double firing on SEMI and the sear is reset to catch the hammer before the hammer hits the firing pin.
In full automatic the sear is held a little further out of the way and the hammer misses it and continues to hit the firing pin until the shooter releases the trigger. The resultant force of the cartridge firing creates an impact on the bolt head that sends force through the rollers into the locking piece, knocking it to the rear. Once the locking piece moves from between the rollers, the bolt is unlocked. As the bullet is leaving the cartridge case, expanding gases pressurize the inside of the case and the flutes in the chamber.
This prevents the case from sticking to the wall of the chamber and residual gas pressure floats the case out of the chamber on this film of high pressure gas. The extractor holds the empty case to the face of the bolt head as it travels to the rear. The carrier rides over the rear of the ejector and the front comes up through the face of the bolt hitting the case as the bolt moves to the rear.
The extractor creates a pivot and the ejector provides thrust as the case is knocked out of the ejection port. While the bolt moves to the rear, the hammer is pushed back and the bolt rides over it. When the bolt moves forward for the next cycle the hammer starts forward, but is held by the catch assembly. The catch assembly holds the hammer until just prior to locking when the carrier trips the release lever which moves the catch assembly and the hammer falls to the sear.
Shooter releases the trigger causing the sear to snap back into position and the gun is ready for the next shot. The sear engages the hammer each time the bolt carrier returns the hammer rearward because of the sear spring moving the sear forward to engage in the sear notch of the hammer.
Because of trigger placement, the hammer will stop and will require resetting of the trigger to move the sear out of the hammer sear notch. Therefore, a release lever and a catch are not required. Follow disassembly procedures for SEF trigger mechanisms. Assembly procedures are the same as SEF without installation of the release lever and the catch.
Using a punch and a hammer, knock out the clamping sleeve under the front sight from front to rear. Pull the front sight out of the holder. There is a front and rear to the sight. Looking at the holder from the front, there is a plunger located to the outside of the center loop of the holder. Press in and remove the cap. Install cap on cocking tube. Insert front sight in holder ensuring it is oriented properly.
Drive in the clamping sleeve from rear to front. With muzzle pointed away from you, looking down on the top of the receiver, pull cocking handle to the rear. Lift handle to the right, push forward, observe the clamping sleeve in the cocking handle support. Note: When the clamping sleeve is centered in the top access hole it is not in alignment in the bottom hole. Align the top hole so the clamping sleeve is only half visible to the left side of the access hole and carefully drive it out.
Pull the handle out, left the muzzle and the cocking support will fall out the rear of the receiver. Install the cocking handle support 2. Place cocking handle into the support 3. Install clamping sleeve. Turn receiver upside down, muzzle to your left. Look down the side of the magazine well closest to you and observe the clamping sleeve in the magazine release button. Drive it out. Pull the button off the shaft of the catch. Push the shaft out of the magazine well.
Reach in through the receiver and cover the spring with your finger, using a small screwdriver, rake the spring out of position.
Tilt the receiver away from you and the contact piece will fall out of the magazine well. Install contact piece with the receiver laying on its right side and the muzzle to your left.
Place contact piece in the approximate position and using a punch guide into place. Press spring into position on contact piece. Install magazine catch from opposite side.
Place button on shaft with flat side towards the muzzle, press to align pin holes, drive in clamping sleeve. Insert rear sight adjustment tool into the rear sight drum and engage the ears of the tool with the notches in the sight.
Lift out the screwdriver portion of the tool and reinsert it being careful to keep the tool perpendicular to the drum. The drum should turn free of the tool. If the tool turns also, do it over. Remove the springs and plungers.
Unscrew the locking screw and remove the screw, the lock washer and the oval spacer. Lift sight base and remove. Replace sight base ball and spring in sight base and reinstall base to receiver, insuring windage screw is placed in slot on underside of sight base.
Install spacer, lock washer, and locking screw. Install springs and plungers, with plungers facing out. Engage adjustment tool and slide drum down to screw into position. DO NOT screw drum tight to the bottom. It is comprised of six major components and we are going to examine each individually.
Case hardened, carries the brunt of the force of the round firing. Contains the rollers, the extractor and spring. Independent of the other parts. Drive clamping sleeve into the body of the bolt head. Remove the rollers and roller holder. Insert tool into the extractor spring loop and rotate lengthwise. Spring will invert and can then be removed, as can the extractor.
Install the extractor, push spring in right side up, push against a hard surface until front of bolt head makes contact, and then lift the rear of the bolt head in a rotating motion. Set a roller on each button, rotate upright, carefully install clamping sleeve. Locking piece angles are critical to the proper function and safety of the gun, dont grind or stone on them.
There are locking pieces for each of the three major variants. Do not interchange these locking pieces!! They act with the bolt head carrier as one piece for functioning purposes.
Contain tungsten granules loose in a cavity under the recoil spring barrel to act as a dead blow to prevent bolt rebound.
Acts with the locking piece as one piece for functioning purposes. Inertia driven, the pin is light and the spring very strong thereby creating a situation where the firing pin doesnt have enough mass to achieve velocity sufficient to overcome the strength of the firing pin spring and cause an accidental discharge if the gun were dropped. This is why the MP5 has no firing pin block. Pulls the firing pin out of contact with the primer once the firing pin has been driven forward.
The spring is further retained by a nylon guide ring at each end. Slide spring back to expose rivets. Punch rivets out, remove end cap and guide ring.
Carefully release tension from the spring and remove spring. Other guide ring can be removed at this time. Bolt Gap Range. After the function check the bolt is to be locked to the rear. To check the gap, point the weapon toward the floor, release the bolt and let it snap forward. Put the selector on semi. Pull the trigger to let hammer fall. Turn the weapon upside down and insert a feeler gauge through the magazine well into the gap between the bolt head and bolt carrier.
Record the measurement once a firm drag is obtained on a gauge. However, the magazine was designed for 30 rounds since space must be left in the magazine for the feed pawl area of the bolt head to compress the stack of rounds during a loading sequence with the bolt forward. The magazine bottom is removable by way of two tabs front and rear. They are stabilized by a locking plate that must be pushed into the magazine before the tabs can be compressed.
Push locking plate into magazine housing. Press tabs in and remove floor plate. Remove the follower spring, follower, and locking plate. Insert the follower magazine spring, locking plate into the housing Push locking plate into housing. Snap floor plate onto magazine. It is fiberglass with a steel reinforced band in the front. Its major problem concerns he ability to dissipate heat.
If the gun is used in a hot environment the gun had a tendency to get quite hot. Tropical wide handguard is polymer with no steel insert and solves the problem of heat dissipation by allowing hot air to rise from the holes in the top of the handguard while drawing cooler air in from the bottom.
There are two sling pieces, one with a carbine hook on one end and a buckle on the other end. The other piece has only one buckle on it and is a double eyed buckle. Lay the first sling on a table with the carbine hook to your left and the spring loaded gate toward you and the sliding sling clip down. Lay the other sling on top and insert the carbine hook through the end compartment of the double eyed buckle from the bottom.
Lay the top sling on the bottom sling and insert the tail of the top sling through the buckle on the opposite end from the carbine hook. The top sling goes in the buckle and loops back over the end of the sling and is reinserted through the buckle from the opposite direction.
A loop forms that will fit over the head and one arm. The double eyed buckle is used to attach to the center sling mount on the left side of the magazine well.
Available are the: 1. If applicable Replace sleeve in spring and reinstall in rear of housing being careful of the position of the spring legs. Engage the dead man leg on the housing stud. Locate trigger return spring on left side of trigger and position it in the housing. Put axle in only far enough to hold it in place.
Lay sear on sear block and rest on catch spring roller, press sear into trigger, push axle through. Release lever 2. Catch assembly 3. Catch axle 4. Hammer 6. Hammer axle 7. Trigger axle 8. Trigger return spring Sear Housing Hammer spring Ejector spring Ejector Ejector spindle Hammer strut. These inspections are generally referred to as LTIs. They are limited in the sense that they do not require full examination of each technical facet of the equipment, but have as their purpose a lesser objective.
LTIs are directed at determining the effectiveness of a maintenance program, or determining weapon safety for firing range use. Once the serial number is accurately recorded, Inspect: 1. Assemble the weapon and do a function check. After the function check measure the bolt gap and record the measurement. This type of inspection is used whenever a weapon needs to be inspected. It is technical in nature but it is limited to visual and very basic measurements taken.
Uses for the LTI are many, here are some examples. Acceptance inspection when you first receive the guns or if you are reestablishing a new armory and are starting new records, a baseline inspection must be made and any discrepancies noted.
Pre-range fire inspection can be as detailed as the inspector wants but should at the very least include a check of the safeties and rod the bore. Post shooting inspection a must after a shooting. Have your paperwork in order for this one since this will end up in court. Scheduled periodic inspection this type of inspection is where the minor problems caused by wear are noticed and repaired before they become major problems.
They should be performed at least annually, but can be as often as necessary depending on user needs. Accountability Records Used to keep track of weapons, if a gun leaves your armory it should have a signature for each. Never get rid of the record of that transfer. In the armory, a serialized inventory should be kept and verified at least annually. Weapons in the armory should be stored by make and model, and in serial number sequence. Round Count Need to keep as accurate a round count as possible.
Helps in budgeting. Maintenance Records Each serial number should have a maintenance record. Everything done to the gun as well as the date and the armorer performing the maintenance should be noted. If there is any question concerning the ability to interchange parts, consult the current Parts List for MP5 Submachine Gun.
If the six-digit part number sometimes referred to as an article, ID or identification number is the same, the parts are interchangeable. If this part number is different, the parts are unique to the weapon s listed therein and should never be mixed.
They will fit and function fine. This clearance cut ensures that the bolt catch is not inadvertently actuated by the left fork of the buttstock should the weapon be fired or the bolt group manually cycled with the buttstock retracted. The left fork will left the bolt catch release lever out away from the receiver causing it to interfere internally with the bolt group inside the receiver of the weapon. The difference in the trigger groups between the 9mm MP5 and those in 10mm and.
The firing pin and firing pin spring are interchangeable. Because of this difference, a standard multipurpose carrying sling can be used but the absence of this clip fails to provide a center mounting point for the standard multi-purpose carrying sling. On the ambidextrous carrying sling, this clip is sewn into the sling webbing so that it may be utilized on the right and left sides of any MP5s. Be advised that the 10mm and the.
Do not confuse this unique design with the 9mm MP5 extractor which has been damaged or cracked. Weapons received prior to that date will be retrofitted with the new extractor design. The new extractor extends beyond the face of the bolt head.
A clearance cut will be made in the barrel to account for the longer extractor a similar arrangement as that used in the HK21E belt-fed machine gun. By extending the length of the extractor, it allows the claw of the extractor to be increased in thickness from 1. The gray extractor spring ID that is often used in the 9mm MP5 due to its greater spring pressure and thus better function and durability, exerts too much pressure on the extractor and can sometimes result in failures to lock over the rim of the cartridge case on the larger 10mm and.
This was done by the designers in an effort to increase the feeding reliability of the MP5 with the 10mm and. You must not interchange locking pieces between dissimilar weapons. While the impulse of the round is based on projectile weight and muzzle velocity, there are other factors that determine the classification of the round as HI or LO impulse.
Consult this Reference Guide and the memorandum for its usage copy attached for further information concerning this subject. Other component parts that are not interchangeable with those of the 9mm MP5s 1.
Cocking lever support Cocking lever Cocking lever spring Bolt carrier Bolt head Protective cap for threaded barrel Ejector Pistol grip, plastic Trigger mechanism, complete ALL magazine components to be improved. These changes should address the problem of the somewhat fragile feed lips of these magazines.
In addition, the new style magazine have raised ribs along the back side and around the rear corners of the magazine housing in addition to those already found along the front edge. This is to prevent the magazine clamps from shearing off the ribs when the magazines are locked together with the dual magazine clamp.
The tab on the magazine follower that actuates the bolt catch has been changed in shape and length to be compatible with the new threaded screw that will replace the front roll pin on the bolt catch see sub paragraph C below. This follower will interchange and work with existing roll pin design. The ammo viewing holes on the back of the magazine are closed but visible for use to indicate. Numerals are not found next to the closed holes 10, 20, and The magazine follower is made from black polymer.
The silver, thinner, extractor spring with the raised center will be used with this new extractor. This new extractor will fit into existing bolt heads but will require a clearance cut in the barrel, like the HK21E see subparagraph F below.
A roll pin will protrude from the back end of the extractor that will fit into the bolt head. This roll pin will fit into the existing unmodified bolt head and will limit the outward movement of the new extractor to prevent the extractor spring from being bent outward and damaged should the bolt group close on an empty case or misfed round.
This threaded screw is not only adjustable and easily replaceable, but it will also remain secure during prolonged use. This item can be retrofitted in existing weapons along with a modified axle see subparagraph F below. New production bolt heads may still exhibit this production anomaly as there is little room in design of this part to eliminate this occurrence completely.
With the larger diameter RSGRA, the tubular guide of the bolt carrier must be drilled out to accommodate this new assembly. This modification will be done during the upgrade of existing weapons described below in subparagraph F and will be in all newly produced weapons. These improvements include the improved extractor, bolt catch, recoil spring guide rod assembly, new magazines with improved followers, and the necessary clearance cut in the barrel for the longer extractor described above.
The 10mm Auto cartridge allows the use of projectiles ranging in weight from as light as grains to as heavy as grains with velocities anywhere from to 1, feet per second. It is the responsibility of the use to insure that the correct locking piece is used in the weapon for the type of ammunition being fired.
The word impulse describes the amount of recoil energy imparted to the bolt group of the MP5 when the cartridge is fired. Impulse varies from one cartridge type to another based on many factors. Some of these factors include projectile weight, muzzle velocity, chamber pressure, peak chamber pressure, and barrel length though there can be other factors that influence the impulse of the round, e.
Optimum impulse in the MP5 submachine gun will ensure that the bolt group is driven rearward in the receiver far and fast enough to provide reliable operation yet not too far rearward that the bolt group strikes the back plate of the buttstock thus accelerating the wear and tear on component parts of the weapon.
Obviously, different cartridge types create different levels of recoil impulse. This factor will cause the bolt group to recoil rearward within the receiver to varying degrees from one type of ammunition to another. When firing the HI impulse ammunition, the HI impulse locking piece, marked AHI 25 on the top side of the locking piece, should be used. Conversely, when firing LO impulse ammunition, the LO impulse locking piece, marked LO 24 should be installed in the weapon.
The angle of the front corners of the locking pieces for different HK roller-locked weapons vary from one locking piece to the other. This angle plays an important role in the unlocking of the bolt after ignition of the cartridge. Varying the angles on the front corners of the locking piece changes the amount of this delay and subsequently the amount of recoil impulse imparted to the bolt group which in turn, as discussed earlier, determines how far rearward the bolt group will travel.
HK has tested and classified various common types of 10mm Auto ammunition see reference guide. If your load is listed on this guide, use the locking piece that is recommended. If not, compare the projectile weight and muzzle velocity of the round that you are using with those on the list.
Once you have found the closest match, use the locking piece that is recommended for that round. It may have been classified but does not appear on the reference guide.
If the 10mm round that you are using does not closely match any of those on the reference guide you can use this basic rule of thumb to get started. If the ammunition exhibits a muzzle velocity under 1, feet per second, it is most likely a LO impulse load and you should use the LO impulse locking piece. Keep in mind that poor function of the weapon could also be caused by other factors, such as unserviceable parts or poor quality ammunition.
Signs of Under Function Not enough impulse - Failure to eject empty cartridge cases - Weak ejection of cartridge case cases just getting out or less than 2 ft. Corrective Action for Under function If you believe there is under function in the weapon based upon the signs listed above, check to see if the HI impulse locking piece is installed. If so, exchange it for the LO impulse locking piece and note the difference in function. Beware of the signs of over function below. There are absolutely no safety or durability concerns if the weapon is fitted with the HI impulse locking piece and LO impulse ammunition is used.
This damage will be visible as the bolt carrier striking the back plate or rubber buffer leaving witness marks or breaking away parts of the rubber buffer - Small bulges in the rear of the receiver from the locking rollers being forced out of the bolt head when the bolt carrier strikes against the back plate of the buttstock - Signs of excessive pressure in the cartridge cases, such as very pronounced or raised flute marks or primers that are flattened or backed out of the cartridge case, failures to extract, or torn cartridge case heads.
If so, exchange it for the HI impulse locking piece and note the difference in function. Beware of the signs of Under function above. Additionally, this scenario can result in permanent damage to the weapon that will not be covered in the warranty. It is the responsibility of the user to ensure the correct locking piece is used in the weapon. This damage could be damage to the back plate or rubber buffer in the buttstock, damage to the bolt carrier or damage to the receiver of the weapon.
This damage will occur over time if the weapon is fired with the incorrect locking piece installed. There are absolutely no safety concerns if the weapon is fitted with a LO impulse locking piece and HI impulse ammunition is fired.
Obviously, if the two types are different in their impulse the choice becomes one of inconvenience of having to swap locking pieces when switching ammunition versus accepting the risk of accelerated wear and tear or damage to the weapon and reduced functional reliability by using the incorrect locking piece. However, this procedure could reduce functional reliability of the weapon below what it would be if the weapon was fitted with the appropriate LO impulse locking piece.
Only the user can decide if this scenario is acceptable based on their own testing of the weapon with the ammunition types they plan to use. Barrel pin, 5. Denotes item s not pictured in illustration. At an additional cost for labor. Can only install barrels as listed above with front sight holders, eyebolt and in black.
Roller, locking, 7. See page 2 in this parts list for the part numbers of the SEF trigger groups. Optional trigger groups can also be purchased as accessories separate from the weapon.
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