Operating Principle

Tine weapon is loaded and cocked, with the safety off. Pulling the trigger releases the hammer, which strikes the firing pin. The cartridge is ignited. The powder gases thus generated drive the bullet out of the barrel. At the same time, these gases also exert pressure on the cartridge case.

This causes forces to act on the bolt head face: a portion of these forces is transmitted to the receiver and a portion to the bolt head carrier. via the locking piece; the balanced angular ratio of the locking piece and barrel extension results in a delayed recoil movement of the bolt head.

This guarantees that the bolt keeps the barrel locked until the bullet has left the muzzle.

Cartridge Bofltoaa Loódtx) picco Firing pin

Cartridge Bofltoaa Loódtx) picco Firing pin


Bond exterior Iocfcing roll« Bert head carne»

Fig. 30 Bolt in locked position

After the locking rollers have been fully cammed into the bolt head, the bolt can continue its recoil movement. In the course of this movement, the empty cartridge case is ejected and the hammer recocked. At the same time, the recoil spring is compressed, which returns the bolt to its forward position. During the course of this process, a new round is chambered from the magazine. The extractor engages the extracting groove in the cartridge case. As a result of the bevelled surfaces of the locking piece, the locking rollers are cammed against the supporting surfaces in the barrel extension (Fig. 31). The weapon is now ready to fire again.

Sopporwg suHaco Fig. 31 Bolt in unlocked position

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