Faxon Firearms Match Series, Heavy Fluted, 1:10 Twist Barrel, 308 Winchester, 18, Rifle Length Gas System, Fits AR10, Nitride Finish, Black 10B810R18FHQ-5R-NP3 Faxon's Match Series of barrels takes their renowned performance and value up a notch. Manufactured in-house from gun-barrel-quality bar-stock" the Match Series starts with 416-R in 5R rifling. 5R is a hybrid rifling" with lands opposite grooves and reduced sharp angles that reduces jacket deformation increasing velocity and easy cleaning. After rigorous testing" the barrels are Nitride treated inside and out" locking in the bore" improving barrel life" and keeping the elements at bay. The extension is coated in a Nickel Teflon coating that maintains incredible dry lubricity" corrosion resistance" and with the coating" tightens up fit between the extension and receiver - again improving upon accuracy. Combined" the Match Series of barrels are ready for when duty calls or the buzzer beeps with unrivaled performance value.