The Excel Arms MR-9 is a 9mm semi-automatic carbine using a rotating bolt and gas-impingement system, unusual for a pistol-caliber carbine. Accepts Glock 17/19-pattern magazines. The polymer stock and lightweight construction give it a distinctive profile. Made in the USA by a small manufacturer. Type: Rifle Action: Semi-Automatic Caliber: 9mm Capacity: 17 Year introduced: 2006, USA Weight: 54 oz Overall length: 34" Status: Active Intended use: Range, Plinking, Home Defense