Manual

Fig. 2. 7.62-mm Dragunov sniper rifle continued:

1 - bolt support; 2 - firing pin; 3 - cover; 4- guiding rod; 5 -

guiding bushing; 6 - bolt; 7 - extractor pin; 8 - firing pin stud; 9 -

extractor spring; 10 - extractor; 11 - return spring; 12 - sight leaf

slide; 13 - sight leaf; 14 - hand guard, L.H. ; 15 - pusher spring; 16

- gas tube latch; 17 - gas chamber; 18 - gas piston; 19 – gas tube 6B1;

20 - gas regulator; 21 - front sight body; 22 - front; 23 - pusher; 24

- front sight base; 25 - barrel; 26 - upper band, assembly; 27 - band

axle pin; 28 - oil seal, assembly; 29 - hand guard, R. H. ; 30 - upper

band with spring; 31 - magazine body, assembly; 32 - magazine spring;

33 - magazine cover; 34 - sight leaf, assembly; 35 - follower; 36 -

receiver; 37 - accidental shot safety device; 38 - firing and trigger

mechanism; 39 - cover axle pin; 40 – butt assembly.

1.4.1. The sniper rifle consists of the following main parts and

mechanisms (Fig. 2):

• barrel with receiver;

• bolt with bolt support;

• safety lever, assembly;

• firing and trigger mechanism;

• cover with retracting mechanism;

• magazine;

• butt;

• upper band, assembly;

• hand guard, L.H., assembly;

• hand guard, R.H., assembly;

• sight leaf, assembly;

• front-sight base and body, assembly.

1.4.2. The sniper rifle is a self-loading weapon. The reloading of the

rifle is based on utilizing the energy of powder gases which arc

channeled from the barrel bore to the gas piston.

Upon firing, a certain amount of the powder gases following the

bullet flows through the port in the barrel bore wall into the gas

chamber, exerts pressure upon the front wall of the gas piston and

throws back the piston with pusher and, consequently, the bolt support

into the rearward position.

As the bolt support travels rearward, the bolt opens the barrel

bore, the cartridge case gets removed from the cartridge chamber and

ejected out of the receiver. The bolt support compresses the return

springs and cocks the hammer; i. e. engages it with the auto-safety

cocking cam.

The bolt support and the bolt return to the front position under the

action of the retracting mechanism; as a result, the bolt feeds the

next cartridge from the magazine into the cartridge chamber and closes

the barrel bore, while the bolt support disengages the auto-safety sear

from the hammer. The hammer gets cocked. The bolt gets locked, after it

has been turned to the left and its locking lugs engaged with recesses

of the receiver.