Sons of Liberty Gun Works Broadsword L89 6mm ARC Barreled Upper - 16" - No Muzzle

The Sons of Liberty Gun Works Broadsword L89 6mm ARC 16-inch barreled upper combines the precision-oriented billet Broadsword upper receiver with the L89 Drivelock rail system and a 16-inch Liberty Fighting Barrel in 6mm ARC — bare-threaded with no muzzle device for builders specifying their own, without BCG or charging handle.

The SOLGW Broadsword L89 16-inch 6mm ARC barreled upper is a complete upper receiver group built on SOLGW's billet Broadsword upper receiver and L89 15.25-inch Drivelock M-LOK handguard, chambered in 6mm ARC. Features a 16-inch Liberty Fighting Barrel, 4140 steel gas block with nitrided gas tube, Drivelock barrel nut system, anti-rotation tabs, internal dowel pin between upper and rail, and integral steel QD cups at the barrel nut on both sides. Muzzle: bare threaded — no muzzle device. BCG and charging handle not included. Test fired before shipment.

The 6mm ARC chambering is the platform's defining capability — a cartridge purpose-engineered by Hornady to deliver long-range ballistic performance from a standard AR-15 bolt and magazine envelope, offering flat trajectories, excellent retained energy at distance, and the ability to stabilize heavy, high-BC projectiles that give AR-15 shooters genuine precision reach well beyond standard 5.56 capability. A 16-inch barrel extracts the full velocity potential of the 6mm ARC cartridge and provides the mid-length dwell time appropriate for reliable cycling with a standard gas system, making this the correct barrel length for a precision-oriented 6mm ARC rifle build. The Broadsword billet upper receiver is precision-machined to tighter tolerances than a standard forged upper, providing a more consistent barrel extension fit and a more precise upper-to-lower interface — the foundation for the accuracy potential of the 6mm ARC cartridge. Combined with the L89 Drivelock system's three independent retention mechanisms — the extended barrel nut, internal dowel pin, and anti-rotation tabs — the Broadsword-89 platform produces what SOLGW describes as the most rigid two-piece upper interface available in conventional AR-15 construction, minimizing the micro-movement that causes point-of-impact shifts when a laser aiming module or VAS system is rail-mounted. The bare-threaded muzzle gives the builder a clean starting point for suppressor mount, muzzle brake, or flash hider installation without removing a pre-installed device or managing timing shims.

Caliber: 6mm ARC. Barrel: 16 inches, Liberty Fighting Barrel. Upper: billet Broadsword. Rail: L89 15.25-inch, seven-sided M-LOK, Drivelock barrel nut, integral steel QD cups both sides, anti-rotation tabs, internal dowel pin. Gas block: 4140 steel, nitrided gas tube. Muzzle: bare threaded — no device. BCG and charging handle: not included. Test fired before shipment.

6mm ARC delivers flat-trajectory long-range AR-15 performance in the standard bolt and magazine envelope — the correct chambering for a precision-build Broadsword upper. Billet Broadsword upper provides tighter tolerances than forging for more consistent barrel extension fit. Drivelock three-point lockup minimizes POI shift with attached lasers and VAS. Bare-threaded muzzle for builder-specified device installation. Test fired before shipment.

The right precision barreled upper for 6mm ARC builds where the buyer wants the Broadsword billet upper's tighter tolerances, L89 Drivelock rigidity, and a bare-threaded muzzle for their own device — without BCG or charging handle.