Specifications

TM 05539-IN

PRINCIPLES OF OPERATION - CONTINUED 0003 00

0003 00-2

GENERAL DESCRIPTION - CONTINUED

f. Feeding. While pushing the bolt handle forward into battery, a live cartridge is stripped from the magazine by the

nose of the bolt. The live cartridge is guided toward the chamber by the feed ramp of the receiver.

g. Chambering. The bolt continues the forward movement of the live cartridge toward the breech until the bolt handle

(3) makes contact with the primary extraction surface of the receiver. At this point the bolt starts to rotate down-

ward, the extractor snaps over the extraction rim of the cartridge case, and the bolt lugs (4) rotate into the breech.

NOTE

Dirt or debris inside the chamber, as well as bent, dented, or otherwise faulty ammunition can prevent

a cartridge from fully chambering or extracting.

h. Locking. While the bolt (3) continues rotating

inside the breech, the bolt lugs (4) start engaging

and locking into the receiver’s lug abutments.

The bolt is locked once it is fully closed into bat-

tery. At this point the weapon is again ready for

firing.

END OF WORK PACKAGE

M40-2004