OVERVIEW The Washington Arms Pepperbox made use of six rotating barrels, each containing their own .31 cartridge. ORIGIN: United States YEAR: 1850 MANUFACTURER(S): Washington Arms Company - USA OPERATORS: United States SPECIFICATIONS Common measurements, and their respective conversions, are shown when possible. Calibers listed may be model/chambering dependent. ACTION: Revolving Barrels; Spring-Loaded Hammer CALIBER(S): .31 LENGTH (BARREL): 71 millimeters (2.80 inches) SIGHTS: None. VARIANTS Series Model Variants • Washinton Arms Pepperbox - Base Series Name.