The Colt Model 6450 is Colt's 9mm pistol-caliber AR-15-pattern carbine, a semi-automatic version of the Colt 9mm SMG used by law enforcement. Features a 16-inch barrel, blowback operation, and uses Colt 9mm SMG-pattern magazines. One of the original pistol-caliber carbines in the modern AR-15 form factor. Widely used by law enforcement agencies that wanted to standardize on AR ergonomics for both pistol and rifle calibers. Type: Rifle Action: Semi-Automatic Caliber: 9mm Capacity: 20 Year introduced: 1985, USA Weight: 6.5 oz Overall length: 34" Status: Discontinued Intended use: Law Enforcement, Tactical, Sport Shooting