The NAA Mini-Revolver in .22 WMR uses a slightly longer cylinder and barrel than the .22 LR version to accommodate the more powerful magnum rimfire cartridge. Still compact enough for palm or pocket carry. Type: Revolver Action: Single-Action Caliber: .22 WMR Capacity: 5 Year introduced: 1980, USA Weight: 4.5 oz Overall length: 4.25" Status: Active Intended use: Deep Concealment