The Colt AR15A4 Lightweight LE Carbine (commonly known by its commercial model number, AR6720) is a highly regarded, nimble 5.56 NATO semi-automatic rifle. It bridges the gap between classic mil-spec law enforcement dependability and a streamlined, easy-handling layout. Core Technical Specifications Caliber: 5.56x45mm NATO / .223 Remington Barrel Length: 16.1 inches Barrel Profile: Lightweight, pencil/lite contour, chrome-lined Twist Rate: 1:7" right-hand twist (stabilizes heavier 62gr to 77gr duty rounds) Weight: 6.2 to 6.3 lbs (unloaded) Operating System: Direct gas impingement Stock: 4-position telescoping/collapsible M4 buttstock Upper Receiver: Flat-top with Picatinny rail for optics Sights: A2 fixed front sight post with a flip-up rear iron sight (typically a Magpul MBUS or MaTech) VERY GOOD CONDITION ONE 30-RD MAGAZINE