Faxon Firearms 18in BIG GUNNER 6.5 Grendel Mid-Length 416-R QPQ Barrel Black Nitride 15BG8Q-5R-NP3. Faxon Firearms designed these AR15 Barrels to be 5R button rifled meaning they have reduced jacket deformation which boosts velocity and is easier to clean. The extension on this Faxon Firearms 18in Gunner 6.5 Grendel Barrel is coated in Nickel Teflon which gives it dry lubricity corrosion resistance and even tightens the fit between the extension and the receiver which in turn enhances your shooting accuracy. To increase durability even further these barrels are Nitride treated which improves the longevity of them and even resists harsh elements so that you can use your rifle rain or shine. Install this Faxon Firearms 18in Match Series 416-R Barrel today on your favorite rifle for a perfect fit and unparalleled performance every time. Specifications for Faxon Firearms 18in BIG GUNNER Barrel: Manufacturer: Faxon Firearms Color: Black Nitride Finish: Nitride Fabric/Material: 416R Stainless Steel Caliber: 6.5mm Grendel Barrel Length: 18 in Barrel Profile: Gunner Gas System Length: Mid Length Gas Block Journal Size-Diameter: .750 in Threads per Inch: 5/8x24 Barrel Twist Rate: 1-8 Barrel Material: 416R Stainless Steel Flutes: No Gun Make: AR Platform Gun Model: AR-10 Weight: 1.68 lb Gas Block Journal Size-Length: 1.9 in Gun Type: Rifle Features of Faxon Firearms 18in Match Series Rifle Barrel: Manufactured 100percent in-house from gun-barrel-quality bar-stock Lands opposite grooves and reduced sharp angles that reduces jacket deformation increasing velocity and easy cleaning Nitride treated inside and out locking in the bore improving barrel life and keeping the elements at bay Extension coated in Nickel Teflon which maintains incredible dry lubricity corrosion resistance and tightens up fit between the extension and receiver Package Contents: Faxon Firearms 18in BIG GUNNER 6.5 Grendel Mid-Length 416-R QPQ Barrel What firearm models does the manufacturer say Faxon Firearms 18in BIG GUNNER Barrel is compatible with? The manufacturer suggests that Faxon Firearms 18in BIG GUNNER Barrel is compatible with AR-10Faxon Firearms 15BG8Q-5R-NP3: 18in BIG GUNNER 6.5 Grendel Mid-Length 416-R QPQ Barrel Black Nitride