The Sons Of Liberty Gun Works M4-89 is an AR-pattern semi-automatic rifle chambered in 5.56mm with a 14.5-inch barrel. The configuration includes a pinned muzzle device (SPMD) and the BW finish. This is a mid-length AR build from SOLGW. 
 

Key Specifications 

• Brand: Sons Of Liberty Gun Works 
• Model: M4-89 
• Caliber: 5.56mm 
• Action: Semi Auto 
• Barrel Length: 14.5 in 
   

Detailed Features 

• 14.5-inch barrel with pinned and welded muzzle device (SPMD) 
• BW finish 
• AR-pattern semi-automatic platform 
• SOLGW M4L89BSCHF145ASR configuration

Owners of the SOLGW M4-89 routinely point to the quality of the build. Sons Of Liberty Gun Works has a reputation for tight tolerances and careful parts selection, and the M4-89 is typically cited as a prime example of that. The 14.5-inch barrel with pinned muzzle device is a common setup for those who want a compact AR without additional paperwork.

The ergonomics track closely with the standard M4 pattern, which means most shooters adapt quickly. The BW finish gets mixed reviews aesthetically, though function is not in question. Some owners wish SOLGW offered more finish options on this particular configuration.

On value, the M4-89 sits at the higher end of the AR market and generates the predictable debate. Fans argue the parts quality justifies the price; critics say similar performance can be had for less. Aftermarket support is broad, as with any AR-pattern rifle.