Faxon Firearms 18in Heavy Fluted 6.5 Grendel Mid-Length 416-R Stainless Steel QPQ Barrel Black Nitride 15BG8-5R-NP3. These AR15 Barrels made by Faxon Firearms are thoroughly tested and Nitride treated which locks in the bore extends the lifespan of the barrel and resists corrosion and harmful elements. This Faxon Firearms 18in 6.5 Grendel Barrel contains a Nickel Teflon coating that resists corrosion and tightens the fit between your receiver and this extension greatly improving your accuracy in the field. Get more out of your rifle with this ultra-durable Faxon Firearms Heavy Fluted Rifle Barrel. Specifications for Faxon Firearms 18in Heavy Fluted Barrel Mid Length: Manufacturer: Faxon Firearms Color: Black Nitride Finish: Nitride Fabric/Material: 416R Stainless Steel Caliber: 6.5mm Grendel Barrel Length: 18 in Barrel Profile: Heavy Fluted 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: Yes Gun Make: AR Platform Gun Model: AR-10 Weight: 1.81 lb Gas Block Journal Size-Length: 1.1 in Gun Type: Rifle Features of Faxon Firearms 18in Heavy Fluted 6.5 Grendel Mid Length 416-R Stainless Steel QPQ Barrel: Manufactured 100percent in-house from gun-barrel-quality bar-stock 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 Coated in a Nickel Teflon coating that maintains incredible dry lubricity corrosion resistance and tightens up fit between the extension and receiver Package Contents: Faxon Firearms 18in Heavy Fluted 6.5 Grendel Mid Length 416-R Stainless Steel QPQ Barrel What firearm models does the manufacturer say Faxon Firearms 18in Heavy Fluted Barrel Mid Length is compatible with? The manufacturer says that Faxon Firearms 18in Heavy Fluted Barrel Mid Length is compatible with AR-10Faxon Firearms 15BG8-5R-NP3: 18in Heavy Fluted 6.5 Grendel Mid-Length 416-R Stainless Steel QPQ Barrel Black Nitride