The Sons of Liberty Gun Works M4-89 Complete Upper features a 16" Combat Barrel in 300 Blackout caliber with a 1:7 twist and a QPQ finish. This black, quality mil-spec-upgraded model boasts a 15" M89 M-LOK Handguard and an A2 Flash Hider for superior performance. Note: BCG and Charging Handle not included.
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 |
