Your cart is empty
Green Mountain Barrels 16" Finned 556 Extended 5.56 mm, 1:7 twist, 16" long, 4150 steel, weighs 1.7 lbs., Black nitride finish, finned barrel, extension with M4 feed ramps, drilled gas port hole, 1/2 x 28" muzzle threading, .750 gas block, carbine length, button rifled, air gauged, stress relieved.