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16" M4 5.56 NATO Replacement Barrel, 1:9 Twist, button rifled, thermo stress relieved, chromed bore and chamber, parkerized finish, .750" gas block with pre-drilled exhaust port. Assembled with M4 feed ramp extension, designed for carbine length gas system, 1/2 x 28 muzzle thread. from Green Mountain Rifle Barrel Co. (Product GM-M9)

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