The 22/45 is a variant of the Mark IV featuring a polymer lower with a grip angle that matches the 1911 pistol, allowing 1911 shooters to practice with economical .22 LR in a familiar grip geometry. The Mark IV version adds the one-button takedown. Type: Pistol Action: Semi-Automatic Caliber: .22 LR Capacity: 10 Year introduced: 2016, USA Weight: 33 oz Overall length: 8.5" Status: Active Intended use: Training, Plinking, Target