The Sons of Liberty Gun Works SOLGW M4-L89 URG 16" 5.56 A2 is a complete AR-15 upper receiver group built around the company’s proven Liberty Fighting Barrel and L89 7-sided M-LOK rail. Featuring a 16" 5.56 NATO barrel capped with an A2 flash hider and a forged upper receiver, this assembly is designed to drop onto a standard AR-15 lower and deliver dependable performance with quality components throughout.

This upper is well suited for general range use, training, and practical carbine work where reliability and consistency matter. The long 15" L89 handguard offers generous mounting space for lights, grips, and other accessories, while the mid-length gas system and Drivelock barrel nut system contribute to smooth operation and secure barrel fit. It is an excellent choice for shooters looking to upgrade an existing rifle or complete a new build with parts from a respected manufacturer known for attention to detail and durable designs.

Key Features:

• Manufacturer: Sons of Liberty Gun Works
• Model: M4-L89 Upper Receiver Group
• Caliber: .223 Rem/5.56 NATO
• Barrel Length: 16"
• Muzzle Device: A2 Flash Hider
• Handguard: 15" L89 7-Sided M-LOK Rail
• Gas System Length: Mid Length
• Bolt Carrier Group Included: No
• Charging Handle Included: No