The FMK Firearms AR1 Extreme AR-15 Lower Multi Caliber DE is a lightweight, high-impact composite polymer lower receiver designed to be the solid foundation of your next AR-15 build. Built to mil-spec dimensions and finished in a dark earth tone, this stripped lower offers superior strength and durability while keeping overall weight to a minimum. This multi-caliber lower receiver is compatible with most standard AR-15 lower parts kits, grips, and stocks, and accepts mil-spec uppers up to .50 Beowulf. Weighing only 4.3 ounces, it is ideal for shooters who want a dependable, semi-auto AR platform without unnecessary bulk, whether for range use, training, or general-purpose rifle builds. The AR1 Extreme reflects FMK Firearms’ commitment to innovative materials and reliable performance. Key Features:
- Manufacturer: FMK Firearms
- Model: AR1 Extreme
- Caliber: Multi-caliber
- Action: Semi-auto
- Product Type: Stripped lower receiver
- Overall Weight: 4.3 oz
- Frame/Receiver Finish: Dark earth
| __Model | AR1 Extreme |
| __Capacity | NA |
| __Caliber | NA |
| __Barrel Length | NA |
| __Optic Footprint | NA |
| __Action | NA |
