The ATI/G.S.G. STG44 RIFLE: FIELD STRIP/DISASSEMBLY, MAGS, OPTICS, PARTS, & ETC!
I bought this interesting rifle for a fun plinker in September 2016, and it cost me $370 from Big 5 Sporting goods. Having been a self-admitted war buff since the 1970's, no history of World War 2 is complete without some mention of this iconic rifle. In the sheer genius and innovation embodied by this rifle, it symbolizes the astounding resourcefulness and sheer folly of the final years of the third Reich. I like to familiarize myself with my brand new guns, so I looked darn near everywhere for more information about it. But after not finding very much information online, I set about gathering resources and information myself, and made this thread as a resource for useful information about the rifle for my fellow STG 44 owners.
If you have a tip. hint, photo or idea about this rifle and want to share please add to this post too.
The rifle is manufactured by German Sport Guns in Germany. It is chambered in .22 LR, and GSG advises to shoot only high velocity ammunition. The gun was introduced in the USA at the 2012 Shot Show, at the price of $600. But thankfully for Sturmgewehr fans, the rifles have dropped in price and you can buy one today, in late 2016 for around $300. For a gun of this quality, that price makes it a positive steal, and it is a worthwhile gun to own for many shooters. The rifle is well crafted, reliable, and accurate, and it is a faithful copy of the original German Sturmgewehr from 1944. But the rather substantial price drop of late, may indicate this rifle will not be in production forever; and so it may be worthwhile to pick one up sooner not later.
ORIGINAL PRODUCTION Sturmgewehr MP44 Vs. GSG STG44
THE STURMGEWEHR CONCEPT
The MP44 was created during World War 2 by a design team led by German small arms geniuses Hugo Schmeisser and Frederick Vollmer. (Both these men later wound up working for the Soviets after the war, and it is even rumored that Vollmer worked on developing the AK-47). The MP44 was a revolutionary rifle in several ways. It introduced onto the battlefield for the first time, the concept of a mid-power rifle round fired from a selective-fire rifle. Previous attempts at such a weapon had used rifles firing only full size rounds, but the results were invariably the same: a heavy and bulky rifle, that when fired on full-auto recoiled far too forcefully to be effective in the hands of the average soldier.
The Sturmgewehr was designed to use a brand-new cartridge, that was a modification of the standard German 7.92 x 57 rifle round. The new bullet was manufactured by necking down and trimming the standard rifle case, and the use of a lighter and shorter bullet. The result was the 7.92 x 33 Kurtz (short) round. The Kurtz round was designed to be effective up to about 400 meters; this was determined by German research as the maximum range that the average soldier could be expected to consistently hit a target on the battlefield, anyway. The new round used less brass, powder and lead then the full sized rifle round and made for a lighter combat load for the soldier. More important, the full-auto capability of the Sturmgewehr was a tremendous force multiplier on the battlefield, particularly on the Eastern front, where the Germans were almost always outnumbered by the Red Army. The average German soldier could now deliver heavy and accurate full-auto fire at ranges up out to 200 meters - far beyond the range of of the Soviet PPSH submachine guns used by their enemies. German troops armed with the Sturmgewehr very often had a dramatic effect on the battlefield wherever it appeared. Unfortunately for the Germans, the 7.92 Kurtz ammo was always in critically short supply as was the rifle itself, and the Germans never had enough of them.
The "assault rifle" effectively filled the small arms gap between short range, open-bolt, pistol caliber submachine guns, and the long-range, but slow firing bolt action rifle. It was intended by the German Waffenamt (Army weapons office) that the Sturmgewehr would eventually replace the KAR98 bolt-action rifle, the Karabiner 43 semi automatic rifle, and the MP38/40 submachine gun. The MP44 was designed for quick mass production using a minimum of complicated machine tooling, so it was manufactured primarily of steel stampings with the number of machined parts including the barrel and bolt being kept to a bare minimum. As early as 1942 early prototypes and variants of the weapon had already been tested, perfected, and even used on the battlefield in small numbers (notably at the battle for the "Demyansk Pocket" in Russia in early 1943 where around 3,000 of the rifles and their ammunition, were air-dropped to desperate German troops facing encirclement by the Red Army). Designers from many German companies had contributed their own prototypes to the Sturmgewehr competition including Erma, Walther, Haenel, Steyr, Mauser and Sauer with the Haenel design ultimately being chosen for mass production. However the FĂĽhrer did not approve mass production of the Sturmgewehr until 1944 - too late to change the fortunes of war for Germany. About 450,000 Sturmgwehrs were made by war's end.
The G.S.G. (GERMAN SPORT GUNS) STG 44 DESIGN AND FABRICATION
The construction of the GSG copy is quite different from the original. Steel stampings are used to fabricate the hand guard, stock adapter and upper receiver. The receiver is a metal casting, made of an alloy known as "Zamac". (Zamac is a zinc-based metal alloyed with aluminum, magnesium and copper.) Method of operation is also very different: the war-time Sturmgewehr is gas-operated; upon firing, the gases are routed through a gas tube to act on a gas piston to force the bolt back; this ejects the round and cocks the hammer for the next shot. By contrast the GSG rifle uses a simple blow-back design, the recoil of firing the bullet moves the bolt backwards in its rails. The bolt strikes the hammer to recock it, while the empty case strikes the ejector to be flung from the rifle, the bolt returns to strip a new round from the magazine and chambers it to fire again. The GSG rifle, like the original, has a spring-loaded dust cover over the ejection port. The port should open when the bolt moves to the rear, whether if by hand or by action of firing.
The magazines are plastic and are available in 25 or 10 round capacity.
Magazine disassembly procedure can be found in the accompanying post, below this one on this page.
The factory finish on the GSG rifle is a combination of bluing and paint. The stamped forearm, the stock extension and most of the other stampings are blued and the rest is painted. The first production Sturmgewehrs had a blued finish, but this changed later depending on the deteriorating German war situation at the time. The rifles that came along later were phosphate finished, and some very late war production guns were even left "in the white" (bare metal), some guns apparently having been produced in such haste they even wore parts finished using all three.
SAFE HANDLING OF THE RIFLE
The owner's manual provided with the rifle describes operation, loading, firing and safety procedures in detail. The rifle generally functions reliably, and most misfires or jams are caused by improper loading of the magazine or other ammo related problems. Notice on this rifle, there is no loaded-chamber indicator nor is there a magazine safety. So any time there is a live round in the chamber, the gun can and will fire - whether a magazine is in place or not. Never chamber a live round until you are ready to shoot.
Always pull the bolt handle back and visually check the chamber for a live round immediately upon picking up the rifle! When the rifle is loaded, always place the safety lever on "SAFE" (Switch pushed DOWN, it will look about the 5 o' clock position) until you are ready to fire. Always keep the muzzle pointed in the safest direction.
"ALL GUNS ARE ALWAYS LOADED."
TOOLS
The rifle is designed to be field-stripped without any special tools except a cleaning rod or Bore Snake, patches, brushes and solvent/CLP. In normal use no other special tools or supplies are needed. Even so, the addition of a few tools will make advanced disassembly of the rifle much easier, should the owner need to do that, in case the gun becomes very dirty or the need arises for changing broken parts.
• 1.5mm and 3mm Hex wrench (for removing the cocking handle screw, lower receiver cover, and the assembling bolt respectively)
• T6, T8, T9 and T15 Torx screwdrivers (if disassembling the magazines or lower receiver)
• Slotted screwdrivers (if disassembling the magazine)
• Old toothbrush (for scrubbing the bolt face and inside the receiver)
FIELD STRIP-DISASSEMBLY
For easy reference a number preceding a part name, indicates its number in the GSG factory exploded view and parts list, at the end of this post.
1. Remove the magazine. Pull back on the cocking handle and visually check the chamber for a round, eject if one is present
2. A pin (#114, "take-down pin") holds the butt stock to the trigger group. This pin is hollow and has a u-shaped piece of bent wire on one end, the wire is spring loaded to keep the pin from falling out. Push in on the end with the spring and pull out the pin from the other side. The end of the wire is sharp so use care if pressing it in by hand. Pliers can be used if needed to press the spring down far enough to pull out the pin.
3. Pull the stock from the receiver. With the stock removed, the trigger group is now free to pivot down. (The trigger group holds in the spring holder, so use care it doesn't swing down out of place when you don't want it to.) Pivot the trigger group down and the bolt parts can now be removed.
4. Pull out and remove part #111, "spring holder" (also called the "end cap").
5. Now tilt the rifle muzzle up and pull the cocking handle to the rear. Pull out #109, "cocking tube spring". Reach under the receiver and into the square opening and slide the bolt group rearwards far enough so you can reach in and pull it out. Remove #113 "bolt buffer" and the bolt group. Please take note of how the parts fit since it is possible to reassemble them wrong later. (In the factory drawing, the part with the bolt and rails is called the "Verschluss" -"Closure" in German...I'll refer to it as the "bolt group" for clarity.) Anyway, an unusual feature of the verschluss is it fits inside the receiver in stamped grooves tilted at about a 30 degree angle. Note the orientation of the bolt buffer as you remove it - when re-installing this part, it goes behind the bolt group in the lower tube of the receiver. The bell shaped end of the bolt buffer - faces to the rear and installs with the tab facing up.
The design of the bolt group or is very similar to an AR15 .22 LR adapter kit. To clean this I spray off the bolt parts with brake cleaner and scrub with an old toothbrush, especially on the face of the bolt and extractor, and that seems to get all the parts plenty clean enough.
It is not necessary to remove the trigger group ( GSG calls this the "Griffstuck" which means "handle", but I'll refer to it as the trigger group). However cleaning the bore is easier if you do remove it. A hollow threaded pin (#107 "assembling bolt") holds the trigger group in place in front; a 3 mm metric hex wrench removes this pin.
5. You may want to remove the cocking handle and cocking tube for cleaning at this point. It is possible, and maybe even preferable to clean inside the receiver without removing these parts - just hosing out the inside with brake cleaner, and a good scrubbing of the breech face and extractor slot in the barrel, is often sufficient. But for a thorough cleaning I remove these parts every so often. Red arrows show cocking handle and cocking handle screw (parts #47 and 48).
The cocking handle is held into the cocking tube by a #48 "cocking lever screw". To access the screw, turn the receiver over, pull the cocking handle to the rear, and locate the screw head at the base of the cocking handle. Use the 1.5 mm hex wrench to unscrew and completely remove the screw. The cocking handle will now come out. (In the image - the silver grease on the screw is anti-seize compound. I used it to "glue" the screw onto the wrench while reinstalling.)
A thoughtful detail that GSG copies from the real thing, is the hole drilled in the rear of the butt stock. This hole is covered by a spring loaded metal plate called #78 "top butt plate". On the wartime MP44's, in this hole the factory added a small instruction manual, a spare firing pin and an extractor. On the GSG rifle this hole comes empty though. But I just use this hole to store the hex wrenches.
Now slide the plastic cocking tube out of the gun too.
6. A stamped steel forearm (part #108) covers the underside of the barrel. This part is a press-fit. Pull down on it and pry gently under the forearm to remove it.
7. For normal cleaning this is as far as you normally need to go. But if your rifle has gotten very dirty, or you need to change a broken part, here are some steps showing how the rifle comes apart in more detail.
The trigger group is a two-piece metal casting. It's held together by torx screws, size T15. Remove the handgrip screws, then unscrew and remove the remaining screws, and separate the trigger group halves.
8. To disassemble the lower receiver halves, first use a torx screw driver (size T9) to remove the (#55) magazine button screw in the center of the magazine release button (lower arrow). Remove (#54) magazine release button, the spring, and (#68) Magazine catch and set them aside. Then using a 3 mm hex wrench, unscrew and remove the two hex screws (shown by the arrows).
The left side of the receiver can now be pulled off its matching half, exposing the barrel mounting screws (2 X T9 screws). I check these screws for tightness every time I have the receiver cover off.
9. I use grease - TW25b, lubriplate, or even auto chassis grease are acceptable - on the bolt rails and on the underside of the bolt where it contacts the hammer. The wear marks on the bolt rails show you where the grease should go. The coil springs in the trigger group, and the action springs for the bolt and cocking handle, get several drops of Breakfree; and i put one drop on each pin in the lower receiver.
If it's cold out, or you'd rather not use any grease, it's a simple matter to remove the butt stock, slide out the bolt assembly and apply several drops of Mobil 1 or other oil to the bolt rails and spring. Sometimes I'll do this right before I go to the range anyway.
CLEANING THE BORE AND CHAMBER
9. Cleaning the bore is less awkward if the trigger group is removed. To clean the bore after firing, first I take a bore mop or patch and soak it with Hoppe's or Kroil and run it through the bore, from the chamber end. I follow the bore mop with a nylon brush, making several passes through the bore to loosen the fouling, followed by a dry patch. If the dry patch comes out dirty, repeat the steps again. When the dry patch comes out clean enough I push a patch or bore mop soaked with Eezox through the bore to protect it from corrosion while the rifle is stored.
CLEANING AND LUBING
If you live in an area where the climate makes your guns prone to rust, most of the anti-corrosion work can probably be covered by a good coating with Eezox of the parts. Use a toothbrush and q-tips to scrub the face of the breech (inside end of the barrel where the bullets go into), the extractor slot in this area, and the feed ramp since this area gets particularly dirty during firing. The bolt face and extractor slot are places to keep clean as new, a build-up of fouling here can cause the rifle to jam if ignored too long.
SUGGESTED LUBRICATION
• Coil springs, assembly pins, hammer and trigger pivot pins; dust cover hinge, spring, and catch pin: Break Free CLP, Mobil 1 automotive oil, or other good gun oil
• Bolt rails, hammer contact surface, screw threads, and bolt contact points; bolt group rail contact points inside the upper receiver.: grease such as TW25B , Lubriplate, Mobil 1 synthetic grease, or Superlube synthetic grease (in cold weather, replace with Mobil 1)
• Magazine spring and follower: molybdenum powder
• Bore, Inside of receiver and stock adapter (where it meets the receiver): Eezox
REASSEMBLY
1. Once your rifle is ready to be put back together, the first step is to reinstall the cocking tube and cocking handle if you removed them. (I didn't use Loctite on this screw...because if I did it might make it next to impossible to remove the screw again.)
2. Now reinstall the trigger group ("Griffstuck") and the assembling bolt and screw if you removed it.
3. Slide the bolt group inside the receiver. The bolt group fits into the rails stamped into the upper receiver - and it is supposed to be at that odd 30 degree angle as installed.
4. Now install the bolt buffer. This part goes in right behind the bolt, with the squared notch to the rear and facing up.
5. Install the cocking spring. This spring fits over the end of the spring tube so wiggle it into place now
6. Install the spring holder (also called the "end cap"). The "cocking tube spring guide" attached to it fits over the cocking spring. Press the spring holder into the rear of the receiver and hold it there.
7. Pivot up the trigger group to capture the parts in place. Reinstall the butt stock and insert the pin.
DECOCKING THE HAMMER
If the gun is cocked, but the rifle is not fired, it is recommended that the hammer be decocked to remove the spring tension before placing the gun in storage. Dry firing is not recommended because it can break the firing pin, when it slams into the face of the breech. So the hammer should be dropped some other way. GSG says to use the procedure below:
There is another way to do this too. First remove the magazine, then check the chamber for a live round and eject it if one is present. Then pull back on the cocking handle, in such a way that the bolt has a small gap (between the breech face and the bolt face) of about one half inch from fully closed. Then pull the trigger to release the hammer. (By pulling open the bolt before pulling the trigger, the firing pin cannot strike the breech face.) Now allow the bolt to go forward, and close the dust cover.
https://www.americantactical.us/category/Rifle Main
Below are the exploded view and parts list from GSG to use when ordering parts.
Parts 1 thru 32
Parts 33-63
Parts 64-95
Parts 96-End
I bought this interesting rifle for a fun plinker in September 2016, and it cost me $370 from Big 5 Sporting goods. Having been a self-admitted war buff since the 1970's, no history of World War 2 is complete without some mention of this iconic rifle. In the sheer genius and innovation embodied by this rifle, it symbolizes the astounding resourcefulness and sheer folly of the final years of the third Reich. I like to familiarize myself with my brand new guns, so I looked darn near everywhere for more information about it. But after not finding very much information online, I set about gathering resources and information myself, and made this thread as a resource for useful information about the rifle for my fellow STG 44 owners.
If you have a tip. hint, photo or idea about this rifle and want to share please add to this post too.
The rifle is manufactured by German Sport Guns in Germany. It is chambered in .22 LR, and GSG advises to shoot only high velocity ammunition. The gun was introduced in the USA at the 2012 Shot Show, at the price of $600. But thankfully for Sturmgewehr fans, the rifles have dropped in price and you can buy one today, in late 2016 for around $300. For a gun of this quality, that price makes it a positive steal, and it is a worthwhile gun to own for many shooters. The rifle is well crafted, reliable, and accurate, and it is a faithful copy of the original German Sturmgewehr from 1944. But the rather substantial price drop of late, may indicate this rifle will not be in production forever; and so it may be worthwhile to pick one up sooner not later.
ORIGINAL PRODUCTION Sturmgewehr MP44 Vs. GSG STG44

THE STURMGEWEHR CONCEPT
The MP44 was created during World War 2 by a design team led by German small arms geniuses Hugo Schmeisser and Frederick Vollmer. (Both these men later wound up working for the Soviets after the war, and it is even rumored that Vollmer worked on developing the AK-47). The MP44 was a revolutionary rifle in several ways. It introduced onto the battlefield for the first time, the concept of a mid-power rifle round fired from a selective-fire rifle. Previous attempts at such a weapon had used rifles firing only full size rounds, but the results were invariably the same: a heavy and bulky rifle, that when fired on full-auto recoiled far too forcefully to be effective in the hands of the average soldier.
The Sturmgewehr was designed to use a brand-new cartridge, that was a modification of the standard German 7.92 x 57 rifle round. The new bullet was manufactured by necking down and trimming the standard rifle case, and the use of a lighter and shorter bullet. The result was the 7.92 x 33 Kurtz (short) round. The Kurtz round was designed to be effective up to about 400 meters; this was determined by German research as the maximum range that the average soldier could be expected to consistently hit a target on the battlefield, anyway. The new round used less brass, powder and lead then the full sized rifle round and made for a lighter combat load for the soldier. More important, the full-auto capability of the Sturmgewehr was a tremendous force multiplier on the battlefield, particularly on the Eastern front, where the Germans were almost always outnumbered by the Red Army. The average German soldier could now deliver heavy and accurate full-auto fire at ranges up out to 200 meters - far beyond the range of of the Soviet PPSH submachine guns used by their enemies. German troops armed with the Sturmgewehr very often had a dramatic effect on the battlefield wherever it appeared. Unfortunately for the Germans, the 7.92 Kurtz ammo was always in critically short supply as was the rifle itself, and the Germans never had enough of them.
The "assault rifle" effectively filled the small arms gap between short range, open-bolt, pistol caliber submachine guns, and the long-range, but slow firing bolt action rifle. It was intended by the German Waffenamt (Army weapons office) that the Sturmgewehr would eventually replace the KAR98 bolt-action rifle, the Karabiner 43 semi automatic rifle, and the MP38/40 submachine gun. The MP44 was designed for quick mass production using a minimum of complicated machine tooling, so it was manufactured primarily of steel stampings with the number of machined parts including the barrel and bolt being kept to a bare minimum. As early as 1942 early prototypes and variants of the weapon had already been tested, perfected, and even used on the battlefield in small numbers (notably at the battle for the "Demyansk Pocket" in Russia in early 1943 where around 3,000 of the rifles and their ammunition, were air-dropped to desperate German troops facing encirclement by the Red Army). Designers from many German companies had contributed their own prototypes to the Sturmgewehr competition including Erma, Walther, Haenel, Steyr, Mauser and Sauer with the Haenel design ultimately being chosen for mass production. However the FĂĽhrer did not approve mass production of the Sturmgewehr until 1944 - too late to change the fortunes of war for Germany. About 450,000 Sturmgwehrs were made by war's end.
The G.S.G. (GERMAN SPORT GUNS) STG 44 DESIGN AND FABRICATION
The construction of the GSG copy is quite different from the original. Steel stampings are used to fabricate the hand guard, stock adapter and upper receiver. The receiver is a metal casting, made of an alloy known as "Zamac". (Zamac is a zinc-based metal alloyed with aluminum, magnesium and copper.) Method of operation is also very different: the war-time Sturmgewehr is gas-operated; upon firing, the gases are routed through a gas tube to act on a gas piston to force the bolt back; this ejects the round and cocks the hammer for the next shot. By contrast the GSG rifle uses a simple blow-back design, the recoil of firing the bullet moves the bolt backwards in its rails. The bolt strikes the hammer to recock it, while the empty case strikes the ejector to be flung from the rifle, the bolt returns to strip a new round from the magazine and chambers it to fire again. The GSG rifle, like the original, has a spring-loaded dust cover over the ejection port. The port should open when the bolt moves to the rear, whether if by hand or by action of firing.
The magazines are plastic and are available in 25 or 10 round capacity.

Magazine disassembly procedure can be found in the accompanying post, below this one on this page.
The factory finish on the GSG rifle is a combination of bluing and paint. The stamped forearm, the stock extension and most of the other stampings are blued and the rest is painted. The first production Sturmgewehrs had a blued finish, but this changed later depending on the deteriorating German war situation at the time. The rifles that came along later were phosphate finished, and some very late war production guns were even left "in the white" (bare metal), some guns apparently having been produced in such haste they even wore parts finished using all three.
SAFE HANDLING OF THE RIFLE
The owner's manual provided with the rifle describes operation, loading, firing and safety procedures in detail. The rifle generally functions reliably, and most misfires or jams are caused by improper loading of the magazine or other ammo related problems. Notice on this rifle, there is no loaded-chamber indicator nor is there a magazine safety. So any time there is a live round in the chamber, the gun can and will fire - whether a magazine is in place or not. Never chamber a live round until you are ready to shoot.
Always pull the bolt handle back and visually check the chamber for a live round immediately upon picking up the rifle! When the rifle is loaded, always place the safety lever on "SAFE" (Switch pushed DOWN, it will look about the 5 o' clock position) until you are ready to fire. Always keep the muzzle pointed in the safest direction.
"ALL GUNS ARE ALWAYS LOADED."
TOOLS
The rifle is designed to be field-stripped without any special tools except a cleaning rod or Bore Snake, patches, brushes and solvent/CLP. In normal use no other special tools or supplies are needed. Even so, the addition of a few tools will make advanced disassembly of the rifle much easier, should the owner need to do that, in case the gun becomes very dirty or the need arises for changing broken parts.
• 1.5mm and 3mm Hex wrench (for removing the cocking handle screw, lower receiver cover, and the assembling bolt respectively)
• T6, T8, T9 and T15 Torx screwdrivers (if disassembling the magazines or lower receiver)
• Slotted screwdrivers (if disassembling the magazine)
• Old toothbrush (for scrubbing the bolt face and inside the receiver)
FIELD STRIP-DISASSEMBLY

For easy reference a number preceding a part name, indicates its number in the GSG factory exploded view and parts list, at the end of this post.
1. Remove the magazine. Pull back on the cocking handle and visually check the chamber for a round, eject if one is present
2. A pin (#114, "take-down pin") holds the butt stock to the trigger group. This pin is hollow and has a u-shaped piece of bent wire on one end, the wire is spring loaded to keep the pin from falling out. Push in on the end with the spring and pull out the pin from the other side. The end of the wire is sharp so use care if pressing it in by hand. Pliers can be used if needed to press the spring down far enough to pull out the pin.

3. Pull the stock from the receiver. With the stock removed, the trigger group is now free to pivot down. (The trigger group holds in the spring holder, so use care it doesn't swing down out of place when you don't want it to.) Pivot the trigger group down and the bolt parts can now be removed.
4. Pull out and remove part #111, "spring holder" (also called the "end cap").
5. Now tilt the rifle muzzle up and pull the cocking handle to the rear. Pull out #109, "cocking tube spring". Reach under the receiver and into the square opening and slide the bolt group rearwards far enough so you can reach in and pull it out. Remove #113 "bolt buffer" and the bolt group. Please take note of how the parts fit since it is possible to reassemble them wrong later. (In the factory drawing, the part with the bolt and rails is called the "Verschluss" -"Closure" in German...I'll refer to it as the "bolt group" for clarity.) Anyway, an unusual feature of the verschluss is it fits inside the receiver in stamped grooves tilted at about a 30 degree angle. Note the orientation of the bolt buffer as you remove it - when re-installing this part, it goes behind the bolt group in the lower tube of the receiver. The bell shaped end of the bolt buffer - faces to the rear and installs with the tab facing up.

The design of the bolt group or is very similar to an AR15 .22 LR adapter kit. To clean this I spray off the bolt parts with brake cleaner and scrub with an old toothbrush, especially on the face of the bolt and extractor, and that seems to get all the parts plenty clean enough.
It is not necessary to remove the trigger group ( GSG calls this the "Griffstuck" which means "handle", but I'll refer to it as the trigger group). However cleaning the bore is easier if you do remove it. A hollow threaded pin (#107 "assembling bolt") holds the trigger group in place in front; a 3 mm metric hex wrench removes this pin.

5. You may want to remove the cocking handle and cocking tube for cleaning at this point. It is possible, and maybe even preferable to clean inside the receiver without removing these parts - just hosing out the inside with brake cleaner, and a good scrubbing of the breech face and extractor slot in the barrel, is often sufficient. But for a thorough cleaning I remove these parts every so often. Red arrows show cocking handle and cocking handle screw (parts #47 and 48).

The cocking handle is held into the cocking tube by a #48 "cocking lever screw". To access the screw, turn the receiver over, pull the cocking handle to the rear, and locate the screw head at the base of the cocking handle. Use the 1.5 mm hex wrench to unscrew and completely remove the screw. The cocking handle will now come out. (In the image - the silver grease on the screw is anti-seize compound. I used it to "glue" the screw onto the wrench while reinstalling.)

A thoughtful detail that GSG copies from the real thing, is the hole drilled in the rear of the butt stock. This hole is covered by a spring loaded metal plate called #78 "top butt plate". On the wartime MP44's, in this hole the factory added a small instruction manual, a spare firing pin and an extractor. On the GSG rifle this hole comes empty though. But I just use this hole to store the hex wrenches.

Now slide the plastic cocking tube out of the gun too.

6. A stamped steel forearm (part #108) covers the underside of the barrel. This part is a press-fit. Pull down on it and pry gently under the forearm to remove it.

7. For normal cleaning this is as far as you normally need to go. But if your rifle has gotten very dirty, or you need to change a broken part, here are some steps showing how the rifle comes apart in more detail.
The trigger group is a two-piece metal casting. It's held together by torx screws, size T15. Remove the handgrip screws, then unscrew and remove the remaining screws, and separate the trigger group halves.

8. To disassemble the lower receiver halves, first use a torx screw driver (size T9) to remove the (#55) magazine button screw in the center of the magazine release button (lower arrow). Remove (#54) magazine release button, the spring, and (#68) Magazine catch and set them aside. Then using a 3 mm hex wrench, unscrew and remove the two hex screws (shown by the arrows).

The left side of the receiver can now be pulled off its matching half, exposing the barrel mounting screws (2 X T9 screws). I check these screws for tightness every time I have the receiver cover off.

9. I use grease - TW25b, lubriplate, or even auto chassis grease are acceptable - on the bolt rails and on the underside of the bolt where it contacts the hammer. The wear marks on the bolt rails show you where the grease should go. The coil springs in the trigger group, and the action springs for the bolt and cocking handle, get several drops of Breakfree; and i put one drop on each pin in the lower receiver.
If it's cold out, or you'd rather not use any grease, it's a simple matter to remove the butt stock, slide out the bolt assembly and apply several drops of Mobil 1 or other oil to the bolt rails and spring. Sometimes I'll do this right before I go to the range anyway.
CLEANING THE BORE AND CHAMBER
9. Cleaning the bore is less awkward if the trigger group is removed. To clean the bore after firing, first I take a bore mop or patch and soak it with Hoppe's or Kroil and run it through the bore, from the chamber end. I follow the bore mop with a nylon brush, making several passes through the bore to loosen the fouling, followed by a dry patch. If the dry patch comes out dirty, repeat the steps again. When the dry patch comes out clean enough I push a patch or bore mop soaked with Eezox through the bore to protect it from corrosion while the rifle is stored.
CLEANING AND LUBING
If you live in an area where the climate makes your guns prone to rust, most of the anti-corrosion work can probably be covered by a good coating with Eezox of the parts. Use a toothbrush and q-tips to scrub the face of the breech (inside end of the barrel where the bullets go into), the extractor slot in this area, and the feed ramp since this area gets particularly dirty during firing. The bolt face and extractor slot are places to keep clean as new, a build-up of fouling here can cause the rifle to jam if ignored too long.
SUGGESTED LUBRICATION
• Coil springs, assembly pins, hammer and trigger pivot pins; dust cover hinge, spring, and catch pin: Break Free CLP, Mobil 1 automotive oil, or other good gun oil
• Bolt rails, hammer contact surface, screw threads, and bolt contact points; bolt group rail contact points inside the upper receiver.: grease such as TW25B , Lubriplate, Mobil 1 synthetic grease, or Superlube synthetic grease (in cold weather, replace with Mobil 1)
• Magazine spring and follower: molybdenum powder
• Bore, Inside of receiver and stock adapter (where it meets the receiver): Eezox
REASSEMBLY
1. Once your rifle is ready to be put back together, the first step is to reinstall the cocking tube and cocking handle if you removed them. (I didn't use Loctite on this screw...because if I did it might make it next to impossible to remove the screw again.)
2. Now reinstall the trigger group ("Griffstuck") and the assembling bolt and screw if you removed it.
3. Slide the bolt group inside the receiver. The bolt group fits into the rails stamped into the upper receiver - and it is supposed to be at that odd 30 degree angle as installed.
4. Now install the bolt buffer. This part goes in right behind the bolt, with the squared notch to the rear and facing up.
5. Install the cocking spring. This spring fits over the end of the spring tube so wiggle it into place now
6. Install the spring holder (also called the "end cap"). The "cocking tube spring guide" attached to it fits over the cocking spring. Press the spring holder into the rear of the receiver and hold it there.
7. Pivot up the trigger group to capture the parts in place. Reinstall the butt stock and insert the pin.
DECOCKING THE HAMMER
If the gun is cocked, but the rifle is not fired, it is recommended that the hammer be decocked to remove the spring tension before placing the gun in storage. Dry firing is not recommended because it can break the firing pin, when it slams into the face of the breech. So the hammer should be dropped some other way. GSG says to use the procedure below:

There is another way to do this too. First remove the magazine, then check the chamber for a live round and eject it if one is present. Then pull back on the cocking handle, in such a way that the bolt has a small gap (between the breech face and the bolt face) of about one half inch from fully closed. Then pull the trigger to release the hammer. (By pulling open the bolt before pulling the trigger, the firing pin cannot strike the breech face.) Now allow the bolt to go forward, and close the dust cover.
https://www.americantactical.us/category/Rifle Main
Below are the exploded view and parts list from GSG to use when ordering parts.

Parts 1 thru 32

Parts 33-63

Parts 64-95

Parts 96-End
