SIONICS in partnership with ICON Defense have engineered the most rigid, robust, and reliable handguard attachment system on the market. Sionic’s revolutionary, patent-pending RM-LOK system utilizes three independent CAMS that precisely engage with the Rotating Mechanism (RM) grooves in our proprietary titanium 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 to ensure maximum engagement and rigidity.

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.

• ARCA compatible – Sionics worked with Really Right Stuff SOAR to insure that our handguards will be compatible with the absolute best in tripod technology; the RRS-Lock™ system. Don’t have an RRS-Lock™ head? Not to worry, our ARCA is compatible with all ARCA interfaces.

• Titanium Barrel nut – Sionic’s 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 – They 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: 20.5oz – 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