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. – 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 etc.) – Accepts Mil-Spec Lower receivers – Fit and function with your standard lower receiver. – Hardcoat Anodized matte black to Military Specifications or better – Does not include forward assist or dust cover assembly.