Arisaka Defense Offset Picatinny Adapter Ocm-C, Osm-K, Osm-M, Ssm-K, Ssm-M

The Arisaka Defense Offset Picatinny Adapter bridges the gap between modern handguard mounting systems and Picatinny-rail accessories. If you're running M-Lok, KeyMod, or CMR slots on your rifle but need to mount lights, lasers, or other Picatinny gear, this adapter solves that compatibility problem without forcing you into a whole new rail ecosystem. It's a straightforward solution: attach it to an Arisaka Offset Scout Mount or Side Scout Mount, and you've got a Picatinny surface ready for your existing lights and optics.

Built from 6061-T6 aluminum and hard coat anodized to MIL-A-8625 Type III spec, the adapter is tough enough for duty use and light enough not to throw your balance off. It's a slim 1.76 inches long and weighs half an ounce, so it tucks in nicely without creating a bulky setup. The design is CNC machined for precision fit—no wobble, no surprises when you mount critical gear.

This is a purpose-built piece of the Arisaka mounting ecosystem. You'll need one of their Scout Mounts (either Offset or Side, in M-Lok, KeyMod, or CMR) to use it, but once you pair them together, you've got a rock-solid mounting solution. Everything ships with the hardware you need—two 8-32x3/8" Torx flat head screws—and it's made in the USA.

Key Features

• Converts M-Lok, KeyMod, and CMR handguards to Picatinny rail—no new handguard needed
• Works with Arisaka Offset Scout Mounts and Side Scout Mounts
• 6061-T6 aluminum with MIL-A-8625 Type III hard anodizing for durability
• Minimal footprint: just 1.76" long and 0.5 oz
• CNC machined for precision fit and zero play
• Includes mounting hardware; made in the USA

Specifications

Frequently Asked Questions

What handguards does this Offset Picatinny Adapter work with?

The adapter is compatible with M-Lok, KeyMod, and CMR (Carry Optics Mounting Rail) handguards, provided it's paired with the appropriate Arisaka Scout Mount for your slot type.

Do I need to buy a Scout Mount separately?

Yes. This adapter must be attached to either an Arisaka Offset Scout Mount or Side Scout Mount (in the matching slot type—M-Lok, KeyMod, or CMR) to function as a complete mounting system.

What lights and accessories can I mount on this adapter?

Any Picatinny-rail accessory will fit, including tactical lights like the Surefire X300, Inforce WML, and similar weapons-mounted optics and gear designed for Picatinny interfaces.

What's included in the box?

The adapter ships with two 8-32x3/8" Torx flat head screws for mounting to your Scout Mount.