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2 was initially produced to equip the airborne units. While the Mk 1 and 1* were primarily made for ground troops or those engaged in airfield security, the next version, the Mk. 1 and 1* were designated the MP.748(e) in German service and around 300,000 were made by Singer Manufacturing Co. 1* emerged, this being the first simplification, with the foregrip, the wooden furniture and the flash hider being deleted to ease production.
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The production guns used the 2 tubes and a flat butt plate, again with a vertical bar behind the grip area for mounting a rifle sling. The barrel jacket (sleeve) had four rows of eight holes. It had a vertical strip behind the grip plates to attach the rifle sling. The forty-six pilot models made at RSAF Enfield used the same stock. The prototypes had the butt stock made from rectangular section strip with two-sided wooden grips retained together by wood screws, heads to the right. It had a conical flash hider and a fine finish, as well as a wooden foregrip, forward handle and part of the stock was wood as well. based in Eindhoven, Holland) at Perivale, Middlesex in December 1940, and is held by the Infantry Weapons Collection, Infantry and Small Arms School Corps, Warminster. 1 was hand-made by Turpin at the Philco Radio Works (part of the multi-national Philips Radio Co. The weapon was very quickly given the name 'STEN', the word being an acronym of 'S' from Shepherd, 'T' from Turpin and 'EN' from either Enfield (where RSAF was located) or England, depending on which source is consulted. The use of the open bolt and pistol ammunition limited effective range however to around 100m.
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Like these weapons it shared a number of advantages and disadvantages in that it was relatively cheap and simple to manufacture and put a significant amount of short range firepower in the hands of the infantry, complimenting the standard issue bolt-action rifles which at best could manage fifteen rounds a minute and were not really suited to close combat. The basic operating principles are similar to those found on many other weapons, including the German MP40, Soviet PPSh-41 and American M3 'Grease' gun. It has no breech locking mechanism the rearward movement of the bolt is attenuated only by the main spring and the inertia of the bolt. This means that the bolt remains to the rear when the weapon is cocked and on pulling the trigger, the bolt flies forward under pressure from the spring, stripping a round from the magazine to feed into the chamber which is immediately fired, all in the same action. It was a relatively simple piece of kit, being a blowback-operated sub-machinegun, firing from an open bolt with a fixed firing pin on the face of the bolt. The prototypes were made by Major Hearn-Cooper. Turpin of the Royal Small Arms Factory (RSAF) Enfield and first fired on 10 January 1941. 40/1' and '40/2', was conceived by Major Reginald V. This design, the first two prototypes of which were called the 'Machine Carbine, N.O.T.