• Colt AR6721 Heavy Barrel 16" AR-15 .223 5.56

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    New in box Colt AR6721 AR-15 A3 Tactical carbine. The AR6721 features a 16.1" heavy barrel with a 1:9 twist, which allows for flexibility in ammunition selection (.223/5.56). It comes with a flattop receiver with an optics-ready rail, Magpul MBUS, and a 30-round PMAG.