The LWRC UCIW (Ultra Compact Individual Weapon) is a piston-operated AR-pistol with an 8.5-inch barrel and LWRC's proprietary short-stroke piston system. Developed alongside U.S. military ultra-compact weapon programs as a civilian-legal near-equivalent. Type: Semi-Auto Pistol Action: Piston-Operated Caliber: 5.56x45mm Capacity: 30 Year introduced: 2010, USA Weight: 5.8 oz Overall length: 23" Status: Active Intended use: Home Defense, Tactical