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. Certified 416R Stainless Steel1:7 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 nomenclatureFine bead blasted finish before final surface treatmentProprietary black surface conversion finish1/2-28 muzzle threads with precision 11 degrees target crownLantac USA barrel contour Lantac Raven .223 Wylde AR15 11.5'' Barrel LA00231