LanTac USA LLC USR, Upper Standard Receiver, 556NATO, AR-15, M4 Feed Ramps, Anodized Black

The Upper Standard Receiver is precision machined with an ultra-smooth proprietary bore. At a roughness average of 16 microin, bolt carrier friction is significantly less than a typical upper receiver creating a silkier action. Barrel nut threads, bore, and barrel extension surfaces are all machined in one operation for a perfectly concentric, perpendicular fit to the barrel assembly.Features: Forged 7075-T6 aluminum receiver MIL-SPEC Type III Class 2 hardcoat anodized finish Ultra-smooth burnished bore M4 feedramps Weight 7.0 oz Made in the U.S.A.LANTAC USA manufactures the highest quality accessories for AR-15/M16 pattern rifles. Precision made in the U.S.A., rifles, muzzle brakes and more.