The Sons of Liberty Gun Works M4-89 Complete Upper is a combat grade weapon featuring a 300 Blackout, 16 inch combat barrel with 1:7 twist, QPQ finish, 15 M89 M-LOK handguard, and an A2 flash hider. This quality product, designed for hard use straight out of the box, comes in black and does not include BCG or Charging Handle.
Specs
| Model No. | SOLGWM489UPPER-16-300 |
| Model | M4 |
| Manufacturer | Sons of Liberty Gun Works |
| Color | Black |
| Caliber | 300 Blackout |
| Barrel Length | 16 |
| Type of Barrel | 1:7 |
