Sons of Liberty Gun Works M4-L89 Upper Receiver Group 16" 5.56 NATO A2 The Sons of Liberty Gun Works (SOLGW) M4-L89 Upper Receiver Group delivers professional-grade performance for AR-15 builds, competitions, and defensive applications. This mil-spec upper is built around a 16-inch Liberty Fighting Barrel chambered in 5.56 NATO, paired with a 15-inch L89 7-sided M-LOK handguard for a versatile and lightweight platform. The Drivelock Barrel Nut System ensures a rock-solid rail interface, while the forged upper receiver provides outstanding durability and compatibility with mil-spec components. Finished in a matte black, this URG ships ready to pair with your preferred lower and BCG. Note: does not include a bolt carrier group or charging handle. Product Highlights 16" 5.56 NATO Liberty Fighting Barrel with mid-length gas system for reliable cycling and a smooth, balanced recoil impulse 15" L89 7-Sided M-LOK Handguard featuring the Drivelock Barrel Nut System and titanium barrel nut for maximum rail stability under hard use A2 Flash Hider for effective muzzle flash suppression in low-light and tactical environments Integral QD Sling Attachment Points at the barrel nut on both sides for flexible sling mounting options Forged Mil-Spec Upper Receiver compatible with standard AR-15 components; matte black finish for a durable, corrosion-resistant surface Specs Brand: Sons of Liberty Gun Works MPN: U-M4L89-556-16-A2 UPC: 657628673057 Caliber: 5.56 NATO Barrel Length: 16" Gas System: Mid-Length Handguard: 15" L89 7-Sided M-LOK Rail Barrel Nut: Drivelock System with Titanium Barrel Nut Muzzle Device: A2 Flash Hider Upper Receiver: Forged Mil-Spec Finish: Matte Black Platform: AR-15 Includes: Upper Receiver Group with 15" L89 Rail Does Not Include: Bolt Carrier Group or Charging Handle QD Attachment: Integral QD&';s at Barrel Nut, Both Sides Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer. ]]>