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16" Heavy Barrel
1 in 9" Twist
Magpul MBUS Backup Sight
Throughout the world today, Colt's reliability, performance, and accuracy provide our Armed Forces the confidence required to accomplish any mission. The Colt AR6721 AR15-A3 Tactical Carbine features a 16" heavy barrel with a 1 in 9" twist, which allows for flexibility in ammunition selection. It also comes equipped with a Magpul MBUS backup sight.