Faxon Firearms A0A863P12NGQ: Faxon Firearms is proud to partner with Q on the development of barrels for their revolutionary new round, 8.6 Blackout (8.6 Black). The 8.6 Black barrels are machined from raw bar stock, fully stress-relieved, air-gauge tested, Magnetic Particle Inspected and 11-degree target crown to ensure superior accuracy. Features button rifling; Big Gunner profile; pistol barrel gas system; Salt Bath Nitride inside and outside finish; M18x1.5 thread, tapered shoulder (adapter included); 11 degree target crowned; 1.9\" gas block journal; standard DPMS Gen 1 .308 Extension, Black Oxide barrel extension.