Faxon's MATCH SERIES of barrels takes our renowned performance and value up a notch. Manufactured 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.The extension is coated in Nickel Teflon which 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: 416-R Stainless Steel Barrel Type: 5R Button Rifled Honed and Lapped Barrel Caliber: 6mm ARC Barrel Twist: 1:7.5 Barrel Length: 20" Barrel Profile: Target Barrel Gas System: Rifle Outside Finish: Bead Blast Muzzle Thread:5/8x24 TPI Gas Block Diameter: .750" Gas Block Journal Length: 1.9" Barrel Extension: M4, Nickel Teflon Coated Weight: 3.13 lbs Magnetic Particle Inspected Recessed Target Crown