[TheErnFormerlyKnownAsBig]

I think a pk is an old russian sniper rifle.

[Poohbah]

The old Russian sniper rifle is the M1891 Moisin-Nagant; the current issue sniper piece is the Dragunov SVD.

[medved]

I think a pk is an old russian sniper rifle.

An RPK is a squad light machinegun, basically a heavier duty AK47 with a stronger and more durable barrel and a heavier (though still stamped) receiver. It still shoots 7.62x39 (AK) ammunition, same as the 47's. If those guys were down to ten rounds of that stuff per man, they were reusing toilet paper.