The Ultimate Handguard Locking System – SIONICS RM-LOK

SIONICS has engineered the most rigid, robust, and reliable handguard attachment system on the market. Our revolutionary, patent-pending RM-LOK system utilizes three independent CAMS that precisely engage with the Rotating Mechanism (RM) grooves in our proprietary barrel nut. This system creates an ultra-secure clamp, locking the rail onto the barrel nut with extreme force and precision, while simultaneously driving the handguard rearward toward the upper receiver.

Unmatched Stability. Uncompromised Performance.

• Zero Shift. The RM-LOK system virtually eliminates barrel-to-handguard flex, ensuring your zero stays rock-solid, even in the most punishing conditions. Whether you are loading into a bipod, tripod, or barricade, rest assured you will see ZERO POI shift.
• No Slippage. No Failures. Designed for absolute durability, this system won’t slide forward under stress, impact, or extreme use.
• Titanium Barrel nut – Our Titanium barrel nuts offer a significant performance upgrade. Their superior strength and rigidity, coupled with enhanced heat dissipation compared to aluminum, provide a more robust and thermally efficient solution. Plus, you’ll benefit from a noticeable weight reduction.
• Steel QD Inserts – Anti-Rotational steel QD inserts insure long lasting engagement with your sling mounting solutions.
• Unmatched Anti-Rotation – Engineered for maximum stability, the extrusion features integrated anti-rotation tabs and a supplemental dowel pin interface for compatible upper receivers, eliminating rotational movement.
• Simple barrel nut tooling – We engineered the barrel nut for compatibility with standard castle nut wrenches, eliminating the need for costly, proprietary tools.

Handguard Specifications

Material: 6061 T6 Aluminum
Finish: Type 3 Hard Coat Anodize – SIONICS Black
Weight: 17.4oz  – Assembled
Diameters: ID 1.39″ & OD 1.61″

RM-Lok Titanium Barrel Nut Specifications

Material: Titanium
Finish: Raw
Weight: 2.2oz
Tooling: Standard Castle Nut Wrench for barrel nut (Included) & T27 for hardware