Never content to settle on the mil-spec, Faxon manufactured enhancements directly into the Forged Upper Receiver. Forged from 7075-T6 Aluminum, the receiver is then trued at the factory to make sure the barrel and barrel nut fit perfectly. Next, they hone the inside bore to smooth out the action of the bolt carrier group. Tighter tolerances on the lugs ensure a solid fit between the upper and lower receiver. The hollowed out shell deflector not only looks great, it reduces some unnecessary weight from the total build. The manually engraved T-marks on the upper will remain visible long after any coating would have worn off. These features combine to provide an upper receiver that is tough enough for anything you can throw at it. FeaturesMaterial: 7075-T6 Forged AluminumFinish: Type III Hard Coat AnodizingCaliber Compatibility: All intermediate cartridges. .458 and large bore rounds may not function