For use in States with restrictions on flash hiders. This is the Barrel from our “SRC” Rifle, built with a permanently attached A2 birdcage style compensator. It is similar to our 16” M4 profile barrel but includes a Picatinny Rail Gas Block (attached to the barrel using taper pins) to which you can mount a variety of accessory front sights. Or, leave the front sight off if you intend to shoot with a scope or optics. Barrel material is 4150 Chrome Moly Vanadium 11595E Steel, and it is Chrome lined in both Bore and Chamber for long wear and ease of cleaning. Button rifling is 1 turn in 9 inches – right hand twist, for optimum accuracy with a wide range of .223 / 5.56mm ammunition. A Black Manganese Phosphate finished is applied for protection against rust and corrosion. This premium barrel kit includes the Barrel Extension (with M4 Feed Ramps), Barrel Nut, Delta Ring, Weld Spring, Snap Ring, Gas Tube, Gas Tube Spring Pin, M4 Double Heatshield Handguards, Front Handguard Cap and Picatinny Rail Gas Block with Sling Swivel.