Faxon Firearms Match Series Gunner AR-15 22 ARC Threaded Barrel. The Gunner profile brings the balance of the rifle back towards the shooter's body limiting fatigue and allowing for shooting training or hunting all day long. 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 barrels are Nitride treated inside and out locking in the bore improving barrel life and keeping the elements at bay. The extension is coated in Nickel Teflon which maintains dry lubricity corrosion resistance and tightens up fit between the extension and receiver. Specifications for Faxon Firearms Match Series Gunner AR-15 22 ARC Threaded Barrel: Manufacturer: Faxon Firearms Finish: Salt Bath Nitride Additional Features: 5R Button Rifled 1-07in. Twist Length: 16 in Package Content Faxon Firearms Match Series Gunner AR-15 22 ARC Threaded Barrel