The LBE Unlimited® AR15 / M4 16" Pistol-Length Gas 300BLK 1:8 Barrel is preferred by both new and experienced rifle builders and is designed for long-lasting field use with your favorite AR pistol. Durable steel construction and a corrosion-resistant black nitride finish combine to provide users with a rugged and reliable rifle barrel. This pistol-length barrel features a 1:8” twist for superior accuracy and unmatched precision with your favorite rifle while the 5/8x24 thread pitch allows you to mount your favorite muzzle devices such as muzzle breaks, flash hiders, and suppressors. Compatible with pistol-length gas systems. Made in USA.