The Magnum Research MLR is a semi-automatic .22 LR built around a Ruger 10/22-compatible action housed in a graphite-reinforced composite stock chassis with an 17-inch stainless barrel. Type: Rifle Action: Semi-Auto Caliber: .22 LR Capacity: 10 Year introduced: 2008, USA Weight: 5.6 oz Overall length: 34.75" Status: Active Intended use: Plinking/Competition