The AR1 Extreme is manufactured in the USA of high impact composite polymer. This polymer allows for superior strength, unmatched durability and is extremely lightweight (4.3 oz). The receiver bears the Thomas Jefferson quote, "The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants." The AR1 Extreme accepts all standard Mil-Spec uppers up to .50 Beowulf and is compatible with most current AR-15 lower parts kits, grips and stocks. It is 100% American made.