The New Model Single-Six in .22 WMR is the dedicated Magnum Rimfire variant, chambered only for .22 Winchester Magnum Rimfire. Many Single-Six revolvers ship with an additional .22 LR cylinder as a convertible, but this variant is the dedicated .22 WMR configuration. The 6.5-inch barrel maximizes WMR velocity. Type: Revolver Action: Single-Action Caliber: .22 WMR Capacity: 6 Year introduced: 1959, USA Weight: 33 oz Overall length: 12" Status: Active Intended use: Small Game Hunting, Recreational