The .22 WMR version of the NAA mini revolver with a 1-inch barrel. Shares the same tiny stainless frame as the .22 LR version but chambers the more powerful WMR cartridge for slightly improved terminal performance. Type: Revolver Action: Single-Action Caliber: .22 WMR Capacity: 5 Year introduced: 1975, USA Weight: 4.5 oz Overall length: 3.63" Status: Active Intended use: Novelty,Backup Carry