The MEGA MATEN Billet Upper Receiver was designed to complement the enhanced features of the MEGA MATEN rifle product line while retaining compatibility with SR25/DPMS pattern accessories to give you the most options for completing your build.All receivers are precision-machined from solid billet aluminum and are held to extremely tight tolerances and high quality standards to ensure consistent fit and function. With its light weight, and superior finish, the MEGA MATEN Billet Upper Receiver is the perfect foundation for any rifle build.MEGA MATEN Billet Upper Receiver features: Machined from American-made 7075-T651 billet aluminum True black Type III Class 2 hard coat anodize Ejection port cover comes pre-installed All proprietary components are included Weight: 14.1 oz