Never content to settle on the mil-spec, we manufactured enhancements directly into the receiver: The receiver is trued by Faxon at the factory Modified upper receiver feed ramps to improve reliability and ease of use We hone the inside bore to smooth out the action of the bolt carrier group Hollow-out the shell deflector to reduce weight and look great Manually engraved T-marks on the upper. Will stay visible after any coating Hold tighter tolerance on the lugs for a better fit Ships Unassembled Faxon Firearms Forged Upper Receivers are available stripped and complete with forward assist and ejection port cover. Specifications: Material: 7075-T6 Forged Aluminum Finish: Type III Hard Coat Anodizing Caliber Compatibility: 338 ARC Weight: .53 lbs (8.48 Ounces)