Sons of Liberty Gun Works built the L89BS Broadsword V2 upper, model M4L89BSUPPER-14.5-556, around a 14.5-inch 4150 Chrome-Moly-Vanadium barrel and a 7-sided L89 rail with a titanium barrel nut and integral QD cups. This is a complete upper assembly — Broadsword receiver, barrel, low-profile gas block, and muzzle device — but it comes without a bolt carrier group, charging handle, or lower receiver, so plan your build accordingly.

Key Specifications

• Chambered in .223 Rem/5.56 NATO
• 14.5-inch barrel length
• 7-sided L89 handguard/rail system
• Titanium barrel nut
• Integral QD sling cups built into the rail
• Broadsword-pattern upper receiver
• 4150 Chrome-Moly-Vanadium (CMV) barrel steel
• Low-profile gas block
• Muzzle device included
• Bolt carrier group and charging handle are NOT included

Frequently Asked Questions

Do I need NFA paperwork to buy this upper? No — this upper is sold without a lower receiver, so on its own it is not a regulated firearm and carries no special NFA requirement. Federal short-barreled-rifle rules only come into play if this 14.5-inch upper is later assembled onto an already-registered, shouldered rifle lower without an approved ATF Form 1 on file; mounted on a pistol-configured lower, it triggers no NFA paperwork at all.

What is not included with this upper? The bolt carrier group and charging handle are not included, and no lower receiver is included, so you will need to source those separately to complete a rifle or pistol.

What barrel steel does this use? It uses a 4150 Chrome-Moly-Vanadium (CMV) barrel, a durable, heat-resistant steel commonly used in mil-spec AR-15 barrels.

Buy the SOLGW L89BS V2 5.56 14.5-inch HUX Upper – Black

Complete your next 5.56 build with a proven Broadsword upper. This SOLGW upper is available to order from a Lubbock, TX gun shop, alongside more AR15 uppers from Sons of Liberty Gun Works.