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Mark V Pistol is a new multiplayer-only weapon introduced in the Unto the Evil DLC. Like its campaign equivalent, it has a weapon modification that allows the pistol to charge up a shot for increased damage. The player spawns with 30 ammo (50 is the max ammo).
On the side of the weapon, it reads 'BFP', likely meaning 'Big Fucking Pistol', similar to the BFG.