The standard 1.875" production Model 351PD 7-shot Airlite .22 WMR is a purpose-built trail and field revolver weighing 10.6 oz. Seven rounds of .22 WMR in a package lighter than almost any defensive handgun makes it a unique outdoors companion. Type: Revolver Action: Double-Action Only Caliber: 22 WMR Capacity: 7 Year introduced: 2004, USA Weight: 10.6 oz Overall length: 6.3" Status: Active Intended use: Trail / Field