The Arisaka Defense Indexer for M-LOK rails in black (Arisaka part no. IDX-M) is a patented, low-profile control built after end users asked for an M-LOK version of Arisaka’s Picatinny Finger Stop. It carries a slim front-to-back profile with a slight radius across both faces, and the main intent is to place it between two fingers, usually the index and middle, further forward on the handguard than most shooters position their support hand. Used this way, the Indexer makes it easier to pull the rifle into the shoulder and maintain control while shooting.

Key Specifications

• Uses a patented, low-profile design with a slim front-to-back profile and a slight radius across both faces.
• Mounts directly to M-LOK rail systems without needing an adapter.
• Positions between two fingers, usually index and middle, for a precise, repeatable index point.
• Forward placement helps shooters pull the rifle into the shoulder and maintain control while firing.
• Also functions well as a hand stop or barricade stop thanks to its wider, flatter profile.
• Acts as a forward limit, helping prevent fingers from slipping off shorter handguards onto a hot barrel or suppressor.

Frequently Asked Questions

Why was the Indexer developed? Arisaka built it after customer demand for an M-LOK version of their Picatinny Finger Stop.

Can it work as a hand stop instead of a finger index? Yes, the wider, flatter profile also functions well as a hand stop or barricade stop.

Buy the Arisaka Defense Indexer, M-LOK, Black

Add a versatile index point to your AR foregrip and hand stop lineup from Arisaka Defense. Order it from our Lubbock, Texas gun shop for fast, reliable shipping.