Designed by Bill Wilson and the Wilson Combat design team to be the base for the ultimate precision tactical AR-10 rifle, the WC-10 upper receiver is precision machined in our Berryville, AR facility.The Wilson Combat WC-10 receiver was engineered from the ground up to address structural design weaknesses in standard USGI-style receivers and enhance overall tolerances.The WC-10 upper receiver has a precise bolt raceway for smoother chambering and more rigid receiver walls to reduce firing flex. The smooth side profile is machined without a forward assist for maximum accuracy potential.Our extensive experience as a premier custom builder of AR rifles will ensure your satisfaction with this next generation precision tactical shooting platform. CNC machined from 7075-T6 aircraft grade solid billet aluminum machined to industry leading tolerances Mil-Spec type 3 hardcoat black anodize finish Picatinny top rail Shell deflector Undersize bolt raceway for smoother chambering, improved feeding and enhanced recoil dynamics Smooth side profile without forward assist for maximum accuracy potential Enhanced receiver will not accept some aftermarket bolt releases Approx weight 11.0 ozNote: Wilson Combat .308 pattern upper receivers are only compatible with Wilson Combat manufacture lowers and not compatible with any other maker's .308 pattern AR lower receiver.