KEY FEATURES
RM-LOK
TITANIUM BARREL NUT
STEEL QD INSERTS
ROTATING CAMS
M-LOK
S-15 HAS UNMATCHED STABILITY. UNCOMPROMISED PERFORMANCE.
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.
- 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.