Olympic Arms' dedicated .22 LR AR in a 20-inch configuration on a standard AR-15 lower. Not a conversion — a purpose-built .22 LR upper and dedicated lower, allowing training on the same ergonomic platform without centerfire ammunition costs. Type: Rifle Action: Semi-Automatic Caliber: .22 LR Capacity: 26 Year introduced: 2002, United States Weight: 80 oz Overall length: 38.5" Status: Discontinued Intended use: Recreational Shooting, Training