The Sons of Liberty Gun Works M4-L89 Upper Receiver Group brings SOLGW’s hard-use philosophy to your next AR-15 build. Centered around a 12.5" 5.56 NATO Liberty Fighting Barrel capped with an A2 flash hider, this complete upper is paired with a forged receiver and the distinctive L89 7-sided M-LOK rail for a rigid, lightweight front end. The 11.75" handguard offers generous mounting space while the Drivelock barrel nut system helps maintain rock-solid alignment and repeatable accuracy.
This upper receiver group is ideal for shooters who want a compact, well-balanced 5.56 platform for range work, training, or general-purpose defensive use when paired with a compatible lower. Integral QD sockets at the barrel nut simplify sling setup, and the extended rail supports modern shooting grips and accessory placement. Backed by Sons of Liberty Gun Works’ reputation for dependable, duty-grade components, the M4-L89 URG is built to be shot hard and trusted for the long haul.
- Manufacturer: Sons of Liberty Gun Works
- Model: M4-L89 Upper Receiver Group
- Caliber: 5.56 NATO
- Barrel Length: 12.50"
- Barrel Type: Threaded
- Flash Hider: A2 Flash Hider
- Handguard: 11.75" L89 7-Sided M-LOK Rail
| __Caliber | 5.56 NATO |
| __Capacity | NA |
| __Barrel Length | NA |
| __Optic Footprint | NA |
| __Action | NA |
| __Model | M4-L89 Upper Receiver Group |
