As per the manufacturer's site:
Faxon's Match Series of barrels takes our renowned performance and value up a notch.
Manufactured 100% 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 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.
Barrel Material: 416R Stainless Steel
Barrel Type: 5R Button Rifled
Barrel Caliber: 6.5 Grendel, SAAMI Chamber (.136" Co-Bore On Bolt)
Barrel Twist: 1:8
Barrel Length: 20"
Barrel Profile: Heavy Fluted
Barrel Gas System: Rifle
Inside Finish: QPQ Nitride
Outside Finish: QPQ Nitride
Muzzle Thread:5/8-24 TPI (Threads Per Inch)
Gas Block Diameter: .750"
Gas Block Journal Length: 1.1"
Barrel Extension: M4, Nickel Teflon Coated
Weight: 1.98 lbs
Magnetic Particle Inspected!
Polished 11-degree Target Crown