This is a Bond Arms Derringer known as the Roughneck chambered in 357 Magnum, model BARN-357/38.
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" 357/38 or 45ACP. Works best with smoothed lined holsters.
Features:
Stainless steel double-barrel and frame
Compatible with all standard Bond Arms barrels
Patented rebounding hammer
Retracting firing pins
Cross-bolt safety
Spring-loaded, cammed locking lever