The Rock Island Armory M1600 is a semi-automatic .22 LR carbine styled to resemble the M16 assault rifle. Built on an aluminum receiver with military-style furniture, the M1600 provides a low-cost .22 LR training platform in the M16 manual-of-arms. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: .22 LR Capacity: 10 Year introduced: 2009, Philippines Weight: 6.1 oz Overall length: 36" Status: Active Intended use: Training, Plinking