The AR1 eXtreme is a multi-caliber, MIL-SPEC AR15 lower receiver from FMK Firearms. This made in the USA lower receiver is constructed from a high-impact proprietary composite polymer. The polymer allows for superior strength, unmatched durability and is lightweight at 4.3 oz. This receiver accepts all standard MIL-SPEC uppers up to .50 Beowulf and is compatible with most current AR15 lower parts kits and furniture. Not designed for 9mm carbine builds. The AR1 eXtreme comes with a lifetime warranty.
- Composite proprietary polymer build
- 4.3 oz - Accepts all standard MIL-SPEC uppers up to .50 Beowulf
- Fits most current AR15 lower parts kits, grips, and stocks (Not compatible with 9mm builds)
- Lifetime warranty
- Custom engraving - "Tree of liberty" quote
