PK Series Manual (English, 2005) - Forgotten Weapons

Figure 1-16. Receiver Assembly (Left Side)
The receiver assembly consists of three components: the receiver frame, the barrel
socket, and the gun stock bracket; all have interlocking grooves and are riveted
together. The receiver frame has a box shape. The tops of the sides are curved inward
and serve to guide the slide.
On the left side of the receiver is the ejection port which can be closed with a shutter.
The shutter is fastened to the receiver with a pin and a spring which continually presses
it downward. The optical (passive night) sight mounting rail is welded to the receiver
frame behind the ejection port. To the rear of the optical sight mounting rail are two
circular openings which hold the wire latch of the shutter pin. The shutter arm is located
inside the left side of the receiver frame and its front curved end protrudes through the
ejection port. The arm serves to open the shutter as the slide moves to the rear position.
A rectangular slot on the front right side of the receiver frame holds lugs of the barrel
socket, into which the feed pawl is attached along with its guard. To the rear of the feed
pawl the receiver frame is grooved inwards longitudinally with a profiled opening on the
front end. The cocking lever fits into the cutout, and its tooth moves through the profiled
opening. On the outside the cocking lever is fastened with a plate that has a longitudinal
groove for the movement of the cocking lever. The plate is welded to the receiver frame.
The top of the receiver frame has a long slot—the rear section of which has wider
cutouts which allow the slide to be removed from the receiver frame. The ejector is
riveted to the upper part of the receiver frame.
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