This short M4 type Barrel – 14.5” in length – features a permanently pinned and welded Extended A2 “Birdcage” Flash Hider. This combination yields an overall length of 16 3/8” for legal use on standard semi-auto rifles. It has the M4 turning for mounting a grenade launcher, and the barrel extension has the M4 style feed ramps. Also included are the Barrel Nut, Front Handguard Cap, A2 Standard Sight Base with Sling Swivel, Front Sight Post, Front Sight Detent, and Bayonet Lug. This high quality barrel is machined from 4150 Chrome Moly Vanadium 11595E Steel, chrome lined in both Bore and Chamber, and Black Manganese Phosphate finished for protection against rust and corrosion. Button rifled 1 turn in 7” (RHT) to stabilize bullets from 50 to 77 grains.