The Sons of Liberty Gun Works M4-L89 Upper Receiver Group 11.5" 5.56 A2 brings together a forged upper, Liberty Fighting Barrel, and L89 7-sided rail to create a compact, dependable AR-15 upper. The 11.5" 5.56 NATO barrel is paired with an A2 flash hider and a 10.75" L89 M-LOK handguard, offering a balanced blend of maneuverability, control, and accessory mounting space for a refined shooting experience.

This upper receiver group is ideal for shooters building a dedicated AR-15 for range use, training, or defensive roles where a shorter barrel and rigid rail are preferred. The integral QD sockets at the barrel nut simplify sling setup, while the Drivelock barrel nut system helps maintain a secure, consistent interface between barrel and receiver. Sons of Liberty Gun Works is known for focusing on reliability, thoughtful component selection, and careful assembly across their Liberty Fighting line.

Key Features:

• Manufacturer: Sons of Liberty Gun Works
• Model: M4-L89 Upper Receiver Group
• Caliber: .223 Rem / 5.56 NATO
• Barrel Length: 11.5"
• Product Type: Upper Receiver Group
• Handguard: 10.75" L89 7-Sided M-LOK Rail
• Muzzle Device: A2 Flash Hider
• Additional Features: Integral QD Sockets, Drivelock Barrel Nut System