Dead Air Sierra-5 KM 5.56mm Suppressor

The Dedicated Workhorse: Performance-First 5.56 Suppression 

The Dead Air Sierra-5, serial SR5-501230, represents Dead Air’s definitive answer to the demand for a dedicated, professional-grade 5.56mm silencer. While multi-caliber suppressors offer versatility, the Sierra-5 was engineered from the ground up specifically for the pressures and flow characteristics of the 5.56 NATO cartridge. It blends the classic aesthetics of the Sandman series with modern internal baffle geometries optimized for maximum sound and flash reduction on modern sporting rifles. The "KM" designation signifies that this unit comes factory-equipped with the KeyMo mounting system—widely considered the most robust and "bomb-proof" quick-attach interface in the industry—making it the ideal choice for shooters who demand hard-use reliability on duty or training rifles.

Condition and Action Highlights

Condition: New in Box (NIB); the unit is unfired and remains in original factory packaging with all standard accessories.

Construction: Fully welded Stellite baffle stack encased in a 17-4 PH Stainless Steel body. Stellite is a cobalt-chromium alloy known for its incredible heat and erosion resistance, ensuring this suppressor can handle high-volume firing schedules and short-barreled "SBR" configurations.

Mounting System: Includes the KeyMo adapter and a 1/2x28 KeyMo Flash Hider. The KeyMo system features a ratcheting mechanism that provides a positive mechanical lock, preventing the suppressor from backing off during fire.

Performance: Features a knurled outer surface for better grip during installation/removal and a specialized flash-hiding front cap that minimizes visual signature in low-light environments.

Maintenance: Features the industry-standard 1.375x24 "HUB" rear threads, allowing the user to swap the KeyMo adapter for Xeno or direct-thread mounts if their mission requirements change.

Technical Specifications

Manufacturer: Dead Air Silencers (USA)

Model: Sierra-5 KM

Serial Number: SR5-501230

Caliber: 5.56 NATO / .223 Remington

Length: 6.27 Inches (with KeyMo)

Weight: 15.4 Ounces

Diameter: 1.5 Inches

Finish: Black Cerakote