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Length: 16" Profile: Sig Modified M4 Profile, Caliber: 5.56x45 Twist: R-1:7, Muzzle: 1/2"-28, Gas Port: Carbine Length, M4 Feed Ramp, Made from: 4140 Chrome moly stress relieved bar stockFinish: Mag phospate coated, Requires .750" Diameter gas blockCHROME LINED, MADE IN THE USA from BRB Tactical Systems (Product BRB-SIGM4556CL1/7-16)

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