This weapon is a special rifle that Buffalo Soldier wields.
The rifle has the same in-game model as the Bayonet Rifle, only colored silver rather than being wooden. It is a Repeater Rifle with a long bayonet, which can be useful when the player is defenseless.
The gun has a "Special Attack" that, when used, causes the gun to fire an extra large blast.
The rifle is also seen in Buffalo Soldier's mission loading screen.