Arisaka Defense Offset Scout Mount KeyMod Black OSM-K

The Arisaka Defense Offset Scout Mount KeyMod (OSM-K) is a premium, low-profile light mounting solution engineered for shooters who demand a streamlined, ergonomic setup on KeyMod-equipped platforms. Designed specifically for Scout-pattern weapon lights, this mount provides a clean, offset positioning that enhances both usability and weapon handling.

Precision machined from durable 6061-T6 aluminum and finished with a black hard-coat anodizing, the OSM-K offers excellent strength, corrosion resistance, and long-term reliability under demanding conditions. Its ultra-slim designmeasuring under 0.20 inches thickkeeps added bulk to a minimum while maintaining a solid and secure attachment.

The 45-degree offset configuration allows the light to sit closer to the handguard, positioning it at intuitive angles such as the 1:30 or 10:30 positions for optimal activation and reduced shadowing. This placement improves ergonomics while keeping the light out of the way of other accessories.

Compatible with a wide range of popular weapon lightsincluding SureFire Scout M300/M600 series, Streamlight Protac Rail Mount models, and Arisaka light bodiesthe mount replaces standard Picatinny adapters for a more integrated, low-drag setup. It also features multiple lateral mounting positions, allowing users to fine-tune light placement for clearance around front sights or other rail-mounted accessories.

Utilizing BCMs patented inverted KeyMod hardware, the OSM-K ensures a secure, repeatable lockup while maintaining a sleek profile. Compact, lightweight, and purpose-built, it is an ideal upgrade for shooters looking to optimize their weapon light placement without adding unnecessary weight or complexity.

Specifications