FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower

Multi-Caliber, Mil-Spec, AR15 Lower Receiver, 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 only 4.3oz. 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,
it’s Proudly American.
Specifications:

Superior strength – Built with proprietary composite polymer to withstand extreme conditions.
Unmatched durability – When most lowers dent or break the AR1 eXtreme bounces back to shape.
Extremely lightweight – 4.3oz • Accepts all standard MIL SPEC uppers up to .50 Beowulf
Compatible with most current AR15 lower parts kits, grips and stocks.