Faxon Firearms 8in Big Gunner Barrel 8.6 BLK Pistol Length 4150 Nitride 1-3 Twist Rate Black. Faxon Firearms is proud to partner with Q on the development of barrels for their revolutionary new round 8.6 Blackout (8.6 BLK). With barrels employing an impressive 1:3 twist rate 8.6 BLK channels rotational energy to increase energy on-target. As with all Faxon Barrels these 8.6 BLK barrels are machined from raw bar stock in our greater Cincinnati Facility. Faxon 8.6 BLK barrels are fully stress-relieved air-gauge tested Magnetic Particle Inspected and 11-degree target crowned to ensure superior accuracy. Constructed of 4150 CMV each barrel goes through a battery of tests at each operation until finished in Nitride and final inspected. All Faxon Barrels are individually checked for headspace by precision custom hardened gauges and are backed by the Faxon Lifetime Guarantee. Specifications for Faxon Firearms Big Gunner Style Barrels: Manufacturer: Faxon Firearms Color: Black Finish: Nitride Fabric/Material: 4150 CMV Caliber: 8.6mm Blackout Barrel Profile: Big Gunner Gas System Length: Pistol Length Gas Block Journal Size-Diameter: .875 in Threads per Inch: M18x1.5 Flutes: Straight Gun Make: DPMS Condition: New Package Contents: Faxon Firearms Big Gunner Style Barrels Thread Protector Taper Adapeter Faxon Firearms 10A863P8NGQ: 8in Big Gunner Barrel 8.6 BLK Pistol Length 4150 Nitride 1-3 Twist Rate Black