The full-size M&P22 is a .22 LR-dedicated pistol in the M&P form factor, not a conversion kit, with an internal hammer mechanism adapted for rimfire. Sized identically to the centerfire M&P for dry-fire training transitions and economical practice. Type: Pistol Action: Semi-Automatic Caliber: .22 LR Capacity: 12 Year introduced: 2012, USA Weight: 24 oz Overall length: 7.5" Status: Active Intended use: ARRAY['range','training','plinking']