M4 Feed Ramp 1/7 Twist Rates 5.56 NATO Mil-Spec 11595E - Certified Barrel Steel (CMV) Chrome Lined Bore and Chamber Manganese Phosphate Barrel Finish Mil-Spec F-Marked Forged Front Sights USGI Government Government Profile Barrels from Bravo Company USA (Product BCM-URG-MID-16LW)

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