This highly accurate Windham Weaponry .300 Blackout Caliber Barrel is 16” in length, and turned in a medium profile. It includes the Barrel Extension, Standard Barrel Nut, Round Front Handguard Cap, a Mil Std 1913 Railed Sight Base with Sling Swivel and Baiynet lug. Its muzzle is threaded 5/8” x 24 T.P.I. to accept a variety of flash hiders or muzzle brakes, and is finished with an 11 degree target crown to enhance accuracy. Machined from 4150 Chrome Moly Vanadium 11595E Steel, this quality barrel is Chrome Lined in both Bore and Chamber for long wear and ease of cleaning. A Black Manganese Phosphate finish offers protection against rust and corrosion. Rifling is 1 turn in 7 inches – right hand twist – with 5 lands & grooves in the “5R” style of rifling – for optimum accuracy with all varieties of .300 Blackout ammunition.