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Along with development and improvement of AK-47, Kalashnikov's Design Bureau had been working on design of general-purpose squad automatic weapon, designated for all kinds of combat troops.
There were modifications for airborne troops, for armored forces and so on, and PK-series (Pulemyot Kalashnikova) for 7.62 x 54 R caliber round was adopted as the standard general-purpose machine gun of the Red Army. Here you can see experimental model and standard PK machine gun.
They illustrate conception of unification - one of these is made for infantry, while another - for mounting on tanks. PKT tank machine gun differs in what electric trigger was incorporated to ensure remotely controlled fire that was attached to the receiver's end plate instead of a butt. This one is PK machine gun for infantry on a mount developed by Evgeniy Samozhenkov.
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