connected with the barrel extension and bolt. During this time it slides under action of recoil in the guides cut in the stationary receiver. The
breech-bolt frame contains the bolt which is also moving rearward and is connected by a link with the front end of a pivoted member, also in the form of a link.
The latter is rotatably mounted in the breech-bolt frame on a pivot. The rear end is connected by means of a pin with one of the supporting links, the other end of which attaches to the barrel extension. The bolt onlv becomes unlocked
from the barrel after the barrel and breech bolt have reached a point where a projection in the stationary receiver breaks the straight-line action of the pivoting links. This allows the bolt to open slowly to produce initial extraction. To complete the function, it carries back the fully loosened cartridge held to its face by the extractor.
The first breaking action of the links withdraws the firing pin slightly within the bolt face.
The continued recoil movement not only hold the firing pin in this position but carries the cartridge to a point where its base collides with an ejector built into the receiver. Here the empty cartridge case is pivoted and ejected through a slot opposite the one through which it was fed. With the barrel extension being unlocked from the bolt, the barrel remains in 2 retracted position. The bolt having completed its full recoil stroke starts counter movemen: and the bolt face, when in position, picks up the incoming round out of the feedway ready for chambering.
At this time the projection on the firing pin catches the sear mounted in the barrel extension. In the final act of locking, the bolt compresses the firing-pin spring. When the bolt and barrel are locked, the continued thrust of the driving spring then shoves the retracted barrel assembly into battery, if the trigger remains dc pressed, the sear releases again, firing the chambered cartridge.
Was this article helpful?