Faxon's 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. Te barrels are Nitride treated inside and out, the ension is coated in a Nickel Teflon coating that maintains dry lubricity, corrosion resistance and with the coating, tightens up fit between the extension and receiver. Features 5R button rifling; heavy fluted profile; rifle barrel gas system; Salt Bath Nitride inside and outside finish; 5/8"x24 thread; recessed target crown; 1.1" gas block journal; standard DPMS LR-308 compatible.