12.7 mm Berezin UB machine gun

The 12.7 mm Berezin UB is a Soviet machine gun. 4 variants of the UB are grouped under this name: the standard UB gun which is nose-mounted and not synchronized, the UBK which is identical to the standard gun but mounted in the wings, the UBS which is synchronized to fire through a propeller and thus has a lower rate of fire, and the UBT which is for turret use.

Berezin later adapted the UB to fire the ShVAK's 20 mm ammunition, creating the Berezin B-20.