YHM has long been a manufacturer of quality AR-15 Upper Receivers and is very proud to offer our A3 Upper Receivers under our own label. Features: These uppers were designed, and are machined 100% in house Made from 7075 T6 aluminum (forged) M4 Style feed ramps and T-markings Inside coated with dry film lube Accepts standard upper receiver parts (dust covers, forward assists) Accepts Mil-Spec lower receivers Fit and function with your standard lower receiver Hardcoat anodized matte black to military specifications or better