Stemple-Suomi Authentic Recreation of Finland’S Winter Warrior Text and Photos by Peter G

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Stemple-Suomi Authentic Recreation of Finland’S Winter Warrior Text and Photos by Peter G Stemple-Suomi Authentic Recreation of Finland’s Winter Warrior Text and photos by Peter G. Kokalis Had you just given up on ever owning an SMG? Kokalis has found a source for a fully-transferable, yet relatively inexpensive, 9mm buzz gun that’s reliable and fun to shoot. BRP’s STG-76W Stemple-Suomi submachine gun is a totally successful recreation of its famous Finnish predecessor, one of the most highly regarded designs ever developed. he Finnish m/31 Suomi submachine gun is one of the in length and 1/4" in width, is located between the magazine a safety device. In addition BRP Corp. manufactures or most highly regarded designs ever developed. Its bat- well opening and the original sear opening. procures bolts, buffers, buttstocks, magazine well housings T tle-proven record is unblemished. Unfortunately, speci- The purpose of this new cut was to install a modifi ed trig- and trunnions that are fully compatible with an unmodifi ed mens in the United States are few and far between. Most ger mechanism that contains a semiautomatic selector and Stemple 76/45 receiver tube. are Pre-1986 dealers’ samples. The few fully transferable ex- amples in this country have sold for astronomical prices. A close friend of mine sold his pristine m/31 Suomi three years ago for $50,000. What if I told you that you could purchase a fully transfer- able, selective-fi re m/31 Suomi submachine gun in brand new condition for only $7,000 plus a $200 transfer tax? Your fi rst reaction would be to scoff and ask, what’s the gimmick? The “gimmick” is that BRP Corp. (Dept. SGN, 7594 Commerce Lane, Clinton, Md. 20735; phone: 301-807-5234; website: www.brpguns.com) assembles and sells a machine gun called the STG-76W that is for all practical purposes on the ex- terior a Finnish m/31 Suomi submachine gun. The Stemple Takedown Gun is an unmodifi ed, fully trans- ferable Stemple 76/45 submachine gun receiver housed in- Its 12-pound weight means many will prefer to fi re the side an m/31 parts kit. With complete BATFE approval, a STG-76W off the heavy-duty bipod that is provided and “semi auto disconnector opening” was added to the bottom that can be attached by means of the short 1913 rail. portion of the Stemple 76/45 receiver. This opening, an inch A threaded trunnion is installed that does not alter the The Suomi trigger housing appearance of the Stemple 76/45 submachine gun receiver. has been modifi ed to fi t the While the m/31 Suomi components added to the Stemple Stemple 76/45 sear opening. 76/45 receiver change its exterior appearance and it out- While the internal compo- wardly looks exactly like the justifi ably famous Finnish m/31 nents are the same, the sear it- Suomi submachine gun, these components are not perma- self was newly manufactured. Stemple-Suomi nently attached to the receiver and they are snapped in place The STG-76W trigger mecha- or affi xed to existing attachment points already on the Stem- nism has three positions: safe, ple 76/45 receiver. semiautomatic and full-auto. As a consequence, BATFE has ruled that none of this All the components, except changes the classifi cation of the Stemple 76/45 receiver. I for the bolt, which has been The barrel is held in place by the barrel jacket. These fi nd this to be brilliant and devilishly clever. left in-the-white, are manga- were of dubious value for cooling, but did protect the hand from a hot barrel and the barrel from damage. More explicitly, here are the similarities and differences nese phosphated. The Finnish m/31 buttstock used on the between the original Finnish m/31 Suomi submachine gun STG-76W is made of beech. The steel buttplate is securely and the BRP STG-76W. The STG-76W fi res from the open- held to the stock by three substantial wood screws. The buf- bolt position just as does the original Finnish m/31 Suomi fer is made from red durometer polyurethane. Pushing the selector bar fully forward will result in full- submachine gun. A substantial number of the STG-76W’s The serrated, spring-loaded, paddle-type magazine catch/ auto fi re. When moved fully rearward, the trigger is blocked important components are those of the m/31 Suomi. release, located directly to the rear of the magazine well, and the weapon cannot be fi red. As an option, you can A newly manufactured magazine-sleeve and barrel shroud must be pressed forward to attach or release a drum or mag- stipulate a full-auto-only fi re control system, which makes were designed to “sleeve over” the STG-76W lock nut and azine. Directly to the rear of the magazine catch/release are reassembly of the weapon much easier. That is now the fi re give the appearance of a Suomi m/31 ventilated barrel jack- nine weight-reducing lightening holes in the trigger housing control system in my personal BRP STG-76W. et. The Suomi bolt body was reduced in diameter to fi t the assembly. The sights are those of the Finnish m/31 Suomi subma- Stemple 76/45 receiver and a hole pattern was drilled for a The following Finnish m/31 Suomi components are found chine gun. The front sight blade can be drifted for adjust- new cocking handle compatible with the cocking handle slot in the STG-76W Stemple-Suomi submachine gun: maga- ment of windage zero, in its dovetail on a steel band wrapped of the Stemple 76/45 receiver. zines and drums (all marked with “SA” in a rectangle, which around the front end of the barrel jacket and retained by a stands for Finnish Army), slings, crosspin. The rear sight, an open U-notch, sliding tangent- extractors, fi ring pins, barrels (with type, can be adjusted for elevation only in 100-meter incre- a modifi ed collar), internal trigger ments from 100 to 500 meters. housing components, and recoil The sling and its attachment points are those of the Finn- springs. BRP Corp. manufactures ish m/31 Suomi. The front sling swivel is located on the left and modifi es the following parts, side, toward the front end, of the ventilated barrel jacket. which together with the m/31 com- The rear end of the sling is retained by a steel bar held over ponents and Stemple 76/45 receiver, a cutout on the left side of the stock by two heavy wood The receiver tube is marked “JOHN R. STEMPLE GROVEPORT, OHIO MODEL 76/45 S/N 753”, because it has been adapted with BATFE approval to the are used to assemble an STG-76W screws. The gray leather sling is 24mm in width and 1320mm Finnish m/31 Suomi confi guration. submachine gun: sear, ejector, bolt, (52 inches) in length. lock nuts, trunnion, magazine well/ The receiver tube of the Stemple-Suomi BRP STG-76W barrel jacket and the lower assem- sent to us for test and evaluation is marked on the left side bly. as follows: “JOHN R. STEMPLE GROVEPORT, OHIO The trigger pack in the BRP MODEL 76/45 S/N 753” and many of the other components STG-76W is a selective-fi re type, carry this serial number or the last two digits thereof. The albeit a bit peculiar. The Finns had left side of the trigger housing assembly is marked, “STG an odd manner in which they de- BRP Corp. STEMPLE 76/45” with the BRP logo, which is signed the semiautomatic mode to the letter “B” in a triangle in a circle. the m/31’s open bolt method of op- The specimen sent to SHOTGUN NEWS has a 1.2-inch eration. Unlike most pistol-caliber long MIL-STD-1913 rail interface attached to the underside submachine guns, which employ a of the barrel jacket near the muzzle. To this can be installed trip lever to pop the sear up after a heavy-duty bipod that is included with the gun. each shot, the m/31 Suomi attached The fi nal result weighs 12 pounds (5.4kg), empty, which a disconnector to the trigger itself. is about a pound and a half heavier than the original Finn- When the trigger is pulled with ish m/31 Suomi, mostly a consequence of the Stemple 76/45 The end cap holds the guide rod the selector bar pushed back to the receiver inside the outer Suomi-type assembly. The left side of the gun’s trigger hous- and the red polyurethane buffer ing assembly is marked, “STG BRP Corp. pad. The receiver is held to the middle, or semiautomatic, position, STEMPLE 76/45” with the BRP logo, which butt and trigger housing by the the sear falls off the trigger hook Disassembly procedures--BRP STG-76W Stemple-Suomi is the letter “B” in a triangle in a circle. large threaded takedown bolt. and springs upward under the com- Using the multi-tool provided or an appropriate screw- pression power of the sear spring, driver, remove the threaded takedown bolt at the rear end which rides on the upper half of a of the receiver tube, just in front of the receiver’s end cap. pin having a pronounced shoulder. When you withdraw the takedown screw, press against the When the trigger is released, the end cap, as it’s under considerable pressure from the recoil trigger hook reengages the back of spring and several times it fl ew across the room when I disas- the sear.
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