The Odin Works® AR-15 16.1" Pistol-Length Gas .300 Blackout Black Nitride Stainless Steel Barrel with Low Pro Gas Block is a drop-in barrel upgrade designed for superior precision and accuracy with your pistol-length AR-15. This barrel features 416R stainless steel construction with a corrosion-resistant nitride finish for superior strength and features an M4 feed ramp for smooth, reliable cycling at the range or in the field. Button 8 twist rifling provides unmatched precision while 5/8-24 threading offers mounting options for your favorite weapon accessories such as muzzle brakes and compensators. Made in USA.