The Henry Deringer Philadelphia Deringer .41 RF is a usa-made single-shot pistol chambered in .41 RF, introduced in 1852. Primary use: hunting, target. Type: Pistol Action: Single-Shot Caliber: .41 RF Capacity: 1 Year introduced: 1852, USA Weight: 26 oz Overall length: 7.4" Status: Discontinued Intended use: hunting, target