All Lantac USA rifle barrels are built to the highest level of precision throughout the entire manufacturing process. Ever barrel starts as a barrel blank which is precision gun drilled double reamed, precision honed and then rifled with a progressive button system utilizing 6 groove rifling that has been proven to produce the highest level of shooting accuracy. Each barrel is chambered and head spaced to a master bolt face and a barrel extension is individually matched to every barrel. Pistol length gas system for reliable operation. Certified 416R Stainless Steel1:8 Twist RateUltra precise, 6 groove, 2 pass button process, proven to perform to the highest levels of accuracyHead-spaced to master bolt faceExtended M4 feed rampsYAG Fiber laser engraved logos and nomenclatureShot peened before final surface treatmentProprietary black surface conversion finish5/8-24 muzzle threads with precision 11° target crownLantac USA barrel contour Lantac Raven .300 BLK AR15 14.5'' Barrel LA00241