How The Sten Gun Works

A loaded magazine being inserted in the magazine housing until it locks, the cocking handle is then pulled back to the cocked position, compress'ng the return spring.

When the trigger is pressed, the heavy breech block is freed and driven forward by the return spring. Feed ribs on the breech block strip the top cartridge from between the lips of the magazine and drive it into the firing chamber. The extractor, which is attached to the oreech bock, snaps into the cannelure in the cartridge case and the firing pin strikes the cartridqe primer exploding the powder.

The inertia of the heavy breech b!oc< and spring in forward motion keeps the breech closed until the bullet has left the barrel and the breecn pressure has dropped to safe limits.

The remaining pressure drives the empty cartridge case and moving parts to the rear. The case strikes against the ejector ano is hurled out of the gun. The magazine spring pushes the next cartridge in line for feeding.

Note: Because of the simplicity of its construction ano its working principle, the Sten needs very little oiling and very I'ttle attention. Unlike many of the more expensive submachine weapons, it i.s not encumbered with trick and unnecessary locking devices which occasion stoppages.

Stoppages are likely to be due almost entirely to de-formed magazines, which should be changed at the first sign of troub e.

This gun wi I do practically anything that the expensive ones will do, though its cost runs only from $10.00 to $20.00 to manufacture—the cost beirg determined by the place of manufacture. (It is now being made in tremendous quantities In Great Britain, Canada, Australia and New Zealand.)

The Sten is being widely used by parachute troops and by the British Home Guards.

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