The Sons of Liberty Gun Works M4 89 is a semi-automatic rifle chambered in .223 Rem / 5.56x45mm NATO with a 16-inch barrel, 30+1 capacity, and black hard coat anodized finish. It weighs 7 lbs. 
 

Key Specifications 

• UPC: 785939518856 
• Action: Semi-Automatic 
• Caliber: .223 Rem / 5.56x45mm NATO 
• Barrel Length: 16 inches 
• Capacity: 30+1 rounds 
• Weight: 7 lbs (14.25 lbs total with accessories) 
• Finish: Black Hard Coat Anodized 
• Manufacturer: Sons of Liberty Gun Works 
• Model Name: M4 89 
   

Detailed Features 

 
The 16-inch barrel runs a 1:7 twist rate, which stabilizes heavier bullets in the 5.56 weight range. The Liberty Fighting Trigger provides a smooth pull with a crisp break. Ambidextrous safety accommodates both right- and left-handed shooters. The B5 Bravo stock adjusts for length of pull. Hard coat anodizing on the aluminum receiver holds up to field use.

The M4 89 gets positive reviews centered on build quality and reliability. Owners note that it cycles consistently with a range of 5.56 and .223 ammunition, and the overall construction feel is frequently described as solid.

The Liberty Fighting Trigger gets specific praise for its pull and reset characteristics, and ergonomics are generally well-received with the adjustable stock accommodating different shooter sizes and gear configurations.

Accessory compatibility and customization are active topics. The rifle works with standard AR-15 components and aftermarket parts, which matters to owners who want to build on the platform over time.

Price is the most common hesitation. SOLGW commands a premium over budget AR alternatives, and discussions about value relative to cost are common. Most who buy in find the American manufacturing focus and build quality meet their expectations; others conclude comparable accuracy is available at lower price points. Customer service experiences vary by individual report.