Manufactured in the USA of a high impact proprietary composite polymer. This state of the art polymer allows for superior strength, unmatched durability and is extremely lightweight. The Ar1 eXtreme is by far the strongest composite polymer lower on the market today. The key to any good project is the foundation and on an AR15" that is the lower receiver. The Ar1 eXtreme comes with a lifetime warranty; and of course, its Proudly American.Features :Superior strength - Built with proprietary composite polymer to withstand extreme conditionsUnmatched durability - When most lowers dent or break the Ar1 eXtreme bounces back to shapeExtremely lightweight - 4.30zAccepts all standard MIL SPEC uppers up to .50 BeowulfCompatible with most current AR15 lower parts kits, grips and stocksUnconditional lifetime warranty,Custom engraving - ,The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.,,