Sons of Liberty Gun Works Broadsword Billet/L89A 6mm ARC Precision 18" Bbl L89A Int ARCA Rail No Muzzle Device Upper Receiver U-BS-L89A-6ARC-18-NMD

The Sons of Liberty Gun Works Broadsword Billet/L89A 18" 6mm ARC Upper is a dedicated long-range precision assembly engineered for the high-performance 6mm ARC cartridge. Built on the reinforced Broadsword-89 billet receiver, this system is designed with extra material at the barrel nut interface to virtually eliminate rail flex and provide an exceptionally stable foundation for high-magnification optics. It features an 18-inch Precision SPR 416R stainless steel barrel with three-groove polygonal rifling, optimized to extract maximum muzzle velocity and consistency for long-range engagements. The standout feature is the 16.75-inch L89A handguard, which integrates a full-length ARCA rail directly into its base for instant and rock-solid attachment to tripods. This "No Muzzle Device" (NMD) version leaves the 5/8x24 threaded muzzle open, allowing shooters to select their own precision-grade brake or suppressor host.