The NAA Sidewinder features a swing-out-style cylinder release — not truly swing-out but side-opening for faster reloading than the standard pin-removal system. 22 WMR chambering. Type: Revolver Action: Single-Action Caliber: 22 WMR Capacity: 5 Year introduced: 1997, USA Weight: 5.5 oz Overall length: 4.5" Status: Active Intended use: concealed carry, backup