▼ 16% below avg
FMK Firearms AR-1 Lower Burnt Bronze
Lowest Price
$31.99
MSRP
$39.99
Savings
20% off
Verified In Stock at
5 Stores
Updated
Aug 26, 2026
Compare Deals from 8 Retailers
Verified availability, then price
Accepts all standard MIL SPEC uppers up to .50 Beowulf
Compatible with most current AR15 lower parts kits, grips and stocks
Custom engraving - The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.""
Extremely lightweight - 4.30z
Superior strength - Built with proprietary composite polymer to withstand extreme conditions
Unconditional lifetime warranty
Unmatched durability - When most lowers dent or break the Ar1 eXtreme bounces back to shape
Specifications
Description
FMK Firearms AR-1 Lower Features The FMK Firearms AR-1 Lower is a state of the art component manufactured in the USA using a high impact proprietary composite polymer. This advanced material selection ensures that the lower receiver maintains superior strength and unmatched durability while remaining extremely lightweight for any build. As the foundation of an AR15 project the Ar1 eXtreme provides a robust and reliable platform that stands up to the rigors of frequent use and diverse environments. Designed to be the strongest composite polymer lower currently available on the market this receiver offers a modern alternative to traditional aluminum builds. The precision engineering involved in its creation ensures a tight fit and finish for your custom firearm assembly. Backed by a lifetime warranty this lower receiver represents a commitment to quality and American craftsmanship providing peace of mind for every shooter. FMK Firearms AR-1 Lower Specifications Manufacturer: FMK Firearms Model: AR-1 Lower Subtype: Lowers Threaded Barrel: None Material: Proprietary Composite Polymer Action: Semi-automatic Type: Stripped Lower Receiver Color: Burnt Bronze Finish: Matte Weight: 0.45 lbs Origin: USA Warranty: Lifetime






