The PKM is a general-purpose machine gun manufactured by Kalashnikov Concern (formerly Izhmash) that chambers the 7.62x54mmR round. The PKM is an improved variant of the original PK machine gun. This weapon was made to replace the older Soviet RP-46 and SG-43 machine guns that were put in service during the 1940's.
Tom Clancy's Rainbow Six: Vegas 1 and 2
The PKM is a weapon that was supposed to be featured in both Tom Clancy's Rainbow Six: Vegas and Tom Clancy's Rainbow Six: Vegas 2, but was later cut from the final product. This weapon was found among the files of the PC versions of both games.