Blackout Defense AR-15 Elite Series barres are top of the line button-rifled barrels that offer the highest degree of precision. It is not unusual for customers of Blackout Defense Elite Series barrels to shoot sub .75 MOA in optimal conditions using match-grade ammunition and other quality components. The Elite Series barrels start with premium 416-R stainless steel bars that are gun-drilled and reamed in 5R rifling and 1:8 twist at the slowest production speeds for the most consistent bore and groove diameters. They are then slowly lead-lapped by hand and held to extreme tolerances, virtually eliminating tooling marks for an exceptional bore finish. The blanks are Mfg: Blackout Defense