Sons of Liberty Gun Works Broadsword Billet/L89A 6mm ARC Precision 16" Bbl L89A Int ARCA Rail No Muzzle Device Upper Receiver U-BS-L89A-6ARC-16-NMD

The Sons of Liberty Gun Works Broadsword Billet/L89A Upper Receiver is a dedicated long-range precision assembly chambered in the high-performance 6mm ARC cartridge. Built on the reinforced Broadsword-89 billet receiver, it is engineered to eliminate rail flex and provide a perfectly stable foundation for high-magnification optics. It features a 16-inch 416R stainless steel barrel with three-groove polygonal rifling, optimized to maximize the aerodynamic efficiency of 6mm ARC projectiles. The standout feature is the L89A handguard, which integrates a full-length ARCA rail directly into the 6 o'clock position for instant tripod attachment. This "No Muzzle Device" (NMD) version utilizes 5/8x24 muzzle threads, allowing the user to select a precision-grade brake or suppressor mount to complete the build.