Butt
A part of a gun
The butt of a gun can be two different things depending on the gun you are using.
1. Pistol: The butt is the base of the pistol-grip, where the magazine is inserted.
2. Rifle: The butt is the rear-most point on the gun. If the rifle has a stock, the butt is the rubber piece on the back end that presses up against your shoulder. If there is no stock, the butt is simply the rear-most point on the gun.