Sons Of Liberty Gun Works Broadsword-89 6Mm Max 18'' Bbl 16.75'' M89 Rail W/NoxSons of Liberty Gun Works$1,187.50
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Sons of Liberty Gun Works
The Sons of Liberty Gun Works Broadsword-89 billet stripped upper receiver brings precision engineering and enhanced rigidity to your AR build. If you're assembling a rifle that demands rock-solid accuracy under aggressive field conditions—whether you're running a bipod hard on the bench, driving from barriers, or pushing precision at distance—this billet upper is designed to keep your point of impact consistent where it counts. Unlike standard forged uppers, the Broadsword-89 is built from billet aluminum, allowing Sons of Liberty to incorporate features that simply aren't possible with conventional manufacturing.
The signature upgrade here is the enhanced handguard lockup system. Relief cuts machined into the upper's face provide seamless integration with M89 and L89 handguards, creating a stiffer, more robust connection than earlier Broadsword designs. This refined lockup measurably reduces rail flex, so whether you're loading hard into a bipod or using a barricade for support, your zero stays true. The engineering team has tested this extensively—the Broadsword-89 delivers the tightest poi control Sons of Liberty has achieved in their upper receiver lineup.
The receiver itself is significantly reinforced throughout its profile, stiffening the critical interface between your barrel and optics mounting surface. This means less harmonic disturbance and more confidence in your groups. You'll also notice the forward assist has been repositioned to give left-hand shooters more clearance when working the charging handle, a thoughtful detail that improves ergonomics without compromise.
This is a stripped upper—no bolt carrier group, no charging handle, no furniture—so you have complete control over your build. It's ready for your preferred barrel, bolt assembly, and handguard system.
| Brand | Sons of Liberty Gun Works |
| Model | Broadsword-89 |
| Type | Billet Stripped Upper Receiver |
| Handguard Compatibility | M89/L89 handguards |
| Finish | Black |
| Configuration | Stripped (bolt carrier group, charging handle, and furniture not included) |
The Broadsword-89 is designed with relief cuts on the upper receiver face to integrate seamlessly with M89 and L89 format handguards. This compatibility ensures the enhanced lockup and reduced rail flex that Sons of Liberty engineered into this platform.
This is a stripped upper receiver only. You'll need to add a bolt carrier group, charging handle, and your preferred barrel and handguard system to complete your build.
Billet construction allows Sons of Liberty to reinforce the entire receiver profile and integrate the M89/L89 handguard relief cuts, creating a significantly stiffer platform. This translates to less rail flex under bipod and barricade loading, and measurably better point-of-impact consistency compared to standard forged designs.
The forward assist repositioning was implemented to improve clearance for left-hand charging handle manipulations. The forward assist remains fully functional for all shooters and techniques.
Sons of Liberty Gun Works
The Sons of Liberty Gun Works Broadsword-89 billet stripped upper receiver brings precision engineering and enhanced rigidity to your AR build. If you're assembling a rifle that demands rock-solid accuracy under aggressive field conditions—whether you're running a bipod hard on the bench, driving from barriers, or pushing precision at distance—this billet upper is designed to keep your point of impact consistent where it counts. Unlike standard forged uppers, the Broadsword-89 is built from billet aluminum, allowing Sons of Liberty to incorporate features that simply aren't possible with conventional manufacturing.
The signature upgrade here is the enhanced handguard lockup system. Relief cuts machined into the upper's face provide seamless integration with M89 and L89 handguards, creating a stiffer, more robust connection than earlier Broadsword designs. This refined lockup measurably reduces rail flex, so whether you're loading hard into a bipod or using a barricade for support, your zero stays true. The engineering team has tested this extensively—the Broadsword-89 delivers the tightest poi control Sons of Liberty has achieved in their upper receiver lineup.
The receiver itself is significantly reinforced throughout its profile, stiffening the critical interface between your barrel and optics mounting surface. This means less harmonic disturbance and more confidence in your groups. You'll also notice the forward assist has been repositioned to give left-hand shooters more clearance when working the charging handle, a thoughtful detail that improves ergonomics without compromise.
This is a stripped upper—no bolt carrier group, no charging handle, no furniture—so you have complete control over your build. It's ready for your preferred barrel, bolt assembly, and handguard system.
| Brand | Sons of Liberty Gun Works |
| Model | Broadsword-89 |
| Type | Billet Stripped Upper Receiver |
| Handguard Compatibility | M89/L89 handguards |
| Finish | Black |
| Configuration | Stripped (bolt carrier group, charging handle, and furniture not included) |
The Broadsword-89 is designed with relief cuts on the upper receiver face to integrate seamlessly with M89 and L89 format handguards. This compatibility ensures the enhanced lockup and reduced rail flex that Sons of Liberty engineered into this platform.
This is a stripped upper receiver only. You'll need to add a bolt carrier group, charging handle, and your preferred barrel and handguard system to complete your build.
Billet construction allows Sons of Liberty to reinforce the entire receiver profile and integrate the M89/L89 handguard relief cuts, creating a significantly stiffer platform. This translates to less rail flex under bipod and barricade loading, and measurably better point-of-impact consistency compared to standard forged designs.
The forward assist repositioning was implemented to improve clearance for left-hand charging handle manipulations. The forward assist remains fully functional for all shooters and techniques.