Sons of Liberty Gun Works M4-EXO3 5.56mm 14.5" Bbl Mid Gas EXO3 Rail No Muzzle Dev Liberty Fighting Bbl & Mil-Spec Upper Receiver U-M4EXO3-556-145-NMD

The Sons of Liberty Gun Works M4-EXO3 Barreled Upper is a duty-ready, mid-length upper receiver group designed for shooters who want a lightweight and streamlined build without sacrificing SOLGW’s core reliability. It features a 14.5-inch Liberty Fighting Barrel (4150 CrMoV) paired with a mid-length gas system, offering a smoother recoil impulse and reduced wear on internal parts. The assembly is built around the EXO3 M-LOK handguard, which provides a slim, robust mounting platform that reduces overall weight compared to the L89 series while maintaining enough rigidity for professional use. As an "NMD" (No Muzzle Device) variant, the 1/2x28 threads are bare, making it an ideal candidate for a custom pin-and-weld project to reach a legal 16-inch rifle length or for use on a registered NFA lower. Sons of Liberty Gun Works M4-EXO3 5.56mm 14.5" Bbl Mid Gas EXO3 Rail No Muzzle Dev Liberty Fighting Bbl & Mil-Spec Upper Receiver U-M4EXO3-556-145-NMD