The Rock Island AL22M ships with two barrels and recoil spring assemblies: one for .22 TCM (proprietary bottleneck cartridge) and one for 9mm, allowing the same frame to function in both calibers. Type: Semi-Auto Pistol Action: Single-Action Caliber: .22 TCM Capacity: 17 Year introduced: 2013, Philippines Weight: 38 oz Overall length: 8.7" Status: Active Intended use: Target, Plinking, Training