Bond Arms Roughneck, Derringer, 45ACP, 2.5 Barrel, Steel, Silver, Rubber Grips, Fixed Sights, 2 Rounds, With Trigger Guard BARN-45ACP The compact, yet rough-looking, Roughneck is a new type of Bond Arm gun. It's built with a 2.5" barrel chambered for 9mm, works best with smoothed lined holsters.