The Sons of Liberty Gun Works SOLGW M4-L89 URG 14.5" 5.56 P/W ASR is a complete upper receiver group built for shooters who demand dependable performance from their AR-15 platform. Featuring a 14.5" 5.56 NATO Liberty Fighting Barrel with a pinned and welded ASR flash hider to achieve a 16" overall length, this upper combines a forged receiver with the sleek L89 7-sided M-LOK rail for a rigid, lightweight front end and generous accessory mounting space.

This upper receiver group is ideal for enthusiasts building a reliable general-purpose carbine for range use, training, or defensive roles where consistency and durability matter. The 13.75" L89 handguard offers ample real estate for lights, grips, and other accessories, while the matte black finish keeps the profile clean and understated. Sons of Liberty Gun Works is known for meticulous assembly standards and hard-use components, and this M4-L89 URG reflects that reputation in every detail.

Key Features:

• Manufacturer: Sons of Liberty Gun Works
• Model: M4-L89 Upper Receiver Group
• Caliber: .223 Rem / 5.56 NATO
• Barrel Length: 14.5" with pinned and welded ASR flash hider (16" OAL)
• Type: Upper Receiver Group
• Rail: 13.75" L89 7-sided M-LOK handguard
• Finish Color: Matte Black
• Compatibility: Fits AR-15
• Included Components: Upper receiver and rail; does not include BCG or charging handle