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Specifications, Length: 16", Caliber: 5.56x45, Twist: 1:7, Muzzle: 1/2"-28, Gas Port: Carbine Length, Forged Front Sight Base, M4 Feed Ramp, Made from: 4140 Chrome moly stress relieved bar stock, Finish: Mag phospate coated, Chrome lined: YES, Requires .750" Diameter gas block, MADE IN THE USA. from BRB Tactical Systems (Product BRB-M4556CL1/7BA-16-2)

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