The Model 442 is the blued aluminum-frame Airweight J-frame in .38 Special +P with a concealed hammer for a completely snag-free draw. The "no lock" designation refers to the absence of S&W's internal key lock system that was added to most S&W revolvers in 2001 and has been controversial — the Model 442 without lock commands a premium from buyers who prefer the original design. Type: Revolver Action: Double-Action Caliber: .38 Special +P Capacity: 5 Year introduced: 1993, USA Weight: 15 oz Overall length: 6.3" Status: Active Intended use: concealed_carry, self_defense, law_enforcement, backup