Sons of Liberty Gun Works121687703
Sons Of Liberty Gun Works M89H15 Heavy Drive Lock M-LOK Handguard - 15"$391.66
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Availability: In Stock
Current Stock: Out of stock
The Sons of Liberty Gun Works M89H is an 11.5-inch M-LOK handguard purpose-built for shooters who demand precision, rigidity, and controlled heat management on their AR platform rifle. This heavy-duty handguard uses the proprietary Drive Lock mounting system—a patent-pending design developed in collaboration with Icon Defense—that clamps to a custom barrel nut with three independent wedges for an exceptionally secure, repeatable fit. Unlike traditional handguard mounting, the Drive Lock system actively drives the handguard rearward toward the upper receiver while the wedges interface with angular grooves in the barrel nut, creating both radial and axial lockup that resists shift or rotation under recoil and hard use.
The 11.5-inch length strikes a balance between maneuverability and sight radius, making it a popular choice for mid-length and short-barrel builds. The handguard's slightly larger inner diameter gives you more working room around the gas block and larger-diameter components compared to Sons of Liberty's M76 model, while the increased wall thickness and extrusion profile enhance rigidity and resist thermal creep—important when running rapid strings or sustained fire. Hard anodized in Mil-Spec MIL-A-8625F Type III finish with a non-reflective NiAc seal, the M89H matches the color and durability of SOLGW receivers and stands up to field use without aesthetic compromise.
Installation is straightforward: the package includes the handguard rail, the proprietary barrel nut, a barrel nut wrench, and all lock-up components needed for mounting. T-Marks are engraved on the rail for reference during assembly. If you're building or upgrading an AR and want a no-compromise handguard that delivers both mechanical security and practical ergonomics, the M89H Drive Lock system offers an engineering advantage you won't find on standard rails.
| Length | 11.5 inches |
| Weight | 15.6 oz |
| Inner Diameter | 1.4 inches |
| Accessory Interface | M-LOK |
| Finish | Hard Anodized, Mil-Spec MIL-A-8625F Type III, Class 2, Non-Reflective, NiAc Seal |
| Mounting System | Drive Lock (proprietary barrel nut and wedge clamp) |
| Included Components | Handguard rail, barrel nut, barrel nut wrench, lock-up components |
The package contains the handguard rail, the proprietary Drive Lock barrel nut, a barrel nut wrench for installation, and all lock-up components (wedges and related hardware) needed to mount the handguard to your upper receiver.
The Drive Lock is a patent-pending clamping mechanism that uses three independent wedges seated in angular grooves on a custom barrel nut. As you tighten the system, the wedges clamp the handguard rail radially while simultaneously driving it rearward toward the upper receiver. This dual-action lockup delivers precision fit and extreme clamping force with minimal runout.
The M89H mounts via the proprietary Drive Lock barrel nut system and requires a compatible upper receiver designed for this mounting method. Verify compatibility with your specific upper before purchase, as the Drive Lock system is not compatible with standard mil-spec barrel nuts.
The M89H is finished in hard anodized Mil-Spec MIL-A-8625F Type III, Class 2 coating with a non-reflective NiAc seal. The color is matched to Sons of Liberty Gun Works receiver finishes for a cohesive, professional appearance.
SKU: 121687711 • Weight: 1.2oz
Availability: In Stock
Current Stock: Out of stock
The Sons of Liberty Gun Works M89H is an 11.5-inch M-LOK handguard purpose-built for shooters who demand precision, rigidity, and controlled heat management on their AR platform rifle. This heavy-duty handguard uses the proprietary Drive Lock mounting system—a patent-pending design developed in collaboration with Icon Defense—that clamps to a custom barrel nut with three independent wedges for an exceptionally secure, repeatable fit. Unlike traditional handguard mounting, the Drive Lock system actively drives the handguard rearward toward the upper receiver while the wedges interface with angular grooves in the barrel nut, creating both radial and axial lockup that resists shift or rotation under recoil and hard use.
The 11.5-inch length strikes a balance between maneuverability and sight radius, making it a popular choice for mid-length and short-barrel builds. The handguard's slightly larger inner diameter gives you more working room around the gas block and larger-diameter components compared to Sons of Liberty's M76 model, while the increased wall thickness and extrusion profile enhance rigidity and resist thermal creep—important when running rapid strings or sustained fire. Hard anodized in Mil-Spec MIL-A-8625F Type III finish with a non-reflective NiAc seal, the M89H matches the color and durability of SOLGW receivers and stands up to field use without aesthetic compromise.
Installation is straightforward: the package includes the handguard rail, the proprietary barrel nut, a barrel nut wrench, and all lock-up components needed for mounting. T-Marks are engraved on the rail for reference during assembly. If you're building or upgrading an AR and want a no-compromise handguard that delivers both mechanical security and practical ergonomics, the M89H Drive Lock system offers an engineering advantage you won't find on standard rails.
| Length | 11.5 inches |
| Weight | 15.6 oz |
| Inner Diameter | 1.4 inches |
| Accessory Interface | M-LOK |
| Finish | Hard Anodized, Mil-Spec MIL-A-8625F Type III, Class 2, Non-Reflective, NiAc Seal |
| Mounting System | Drive Lock (proprietary barrel nut and wedge clamp) |
| Included Components | Handguard rail, barrel nut, barrel nut wrench, lock-up components |
The package contains the handguard rail, the proprietary Drive Lock barrel nut, a barrel nut wrench for installation, and all lock-up components (wedges and related hardware) needed to mount the handguard to your upper receiver.
The Drive Lock is a patent-pending clamping mechanism that uses three independent wedges seated in angular grooves on a custom barrel nut. As you tighten the system, the wedges clamp the handguard rail radially while simultaneously driving it rearward toward the upper receiver. This dual-action lockup delivers precision fit and extreme clamping force with minimal runout.
The M89H mounts via the proprietary Drive Lock barrel nut system and requires a compatible upper receiver designed for this mounting method. Verify compatibility with your specific upper before purchase, as the Drive Lock system is not compatible with standard mil-spec barrel nuts.
The M89H is finished in hard anodized Mil-Spec MIL-A-8625F Type III, Class 2 coating with a non-reflective NiAc seal. The color is matched to Sons of Liberty Gun Works receiver finishes for a cohesive, professional appearance.
SKU: 121687711 • Weight: 1.2oz