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Carbine Gas System Mil-Spec M4 Barrel extension w/ 5.3.1.2 MIL-STD-171 Phosphate Finish 1.2.2.2 MIL-STD-171 Hard Chrome Chamber 1.2.2.2 MIL-STD-171 Hard Chrome Bore 5.56 NATO 1 in 7 Twist high pressure tested magnetic particle inspected 1/2x28 Thread pitch Weighs 28.0oz from Primary Arms (Product SB51605-M4)

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