SOLGW M4-L89 URG 16" 5.56 A2 – Complete AR-15 Upper Receiver Group

The Sons of Liberty Gun Works M4-L89 URG is a complete 16" upper receiver group chambered in 5.56 NATO, designed for mil-spec AR-15 lower receivers. This configuration features an A2 front sight base and carries forward the proven M4 carbine platform with SOLGW's quality control standards. The 16" barrel length meets legal requirements in all states while providing effective ballistics for 5.56 ammunition at practical engagement distances.

Built with a forged 7075-T6 aluminum upper receiver and mil-spec barrel extension. The assembly includes a carbine-length gas system matched to the barrel profile for reliable cycling with standard 5.56 NATO and .223 Remington ammunition. Ships as a complete upper receiver group ready to mate with any mil-spec AR-15 lower—no additional parts or gunsmithing required for installation. Finish and specific handguard configuration may vary; verify current specifications with manufacturer documentation.

• Caliber: 5.56 NATO / .223 Remington
• Type: Complete Upper Receiver Group
• Compatible Lower: Mil-spec AR-15
• Barrel Length: 16"
• Material: 7075-T6 Forged Aluminum (upper receiver)
• Finish: Type III Hard Coat Anodized
• Includes: Complete upper assembly, bolt carrier group, charging handle
• Installation: Drop-in fit for mil-spec AR-15 lowers, no gunsmithing required