The Dead Air Sandman X KeyMo FDE is a .30 caliber Haynes 282 suppressor in flat dark earth Cerakote, set up on Dead Air’s KeyMo quick-detach mount (Dead Air part no. SMXKMFDE). Dead Air calls the Sandman X the pinnacle of its Sandman line, built to optimize sound, balance backpressure and eliminate flash on semi-automatic and bolt-action rifles. In the KeyMo configuration it measures 6.9 inches and weighs 16.8 ounces. It is rated up to .300 RUM and 4200 ft-lbs, full-auto rated, and carries no barrel restrictions. The Sandman X was a Shoot On 2025 Excellence Award recipient.

Key Specifications

• The mount is KeyMo quick-detach, Dead Air’s QD system for moving the can between rifles.
• Length is 6.9 inches in the KeyMo configuration, a compact package for a .30 caliber can.
• Weight is 16.8 ounces with the KeyMo mount, Dead Air’s figure for this setup.
• The material is Haynes 282, a high-temperature nickel-based alloy for sustained fire.
• The finish is Flat Dark Earth high-temperature Cerakote, which matches tan rifle builds.
• The caliber rating is up to .300 RUM, covering .308 and the .30 caliber magnums.
• Energy is rated to 4200 ft-lbs, the ceiling Dead Air publishes for the Sandman X.
• Bore diameter is .30 caliber, sized for .30 caliber and smaller bullets.
• Diameter is 1.65 inches, which sets the clearance needed at the muzzle.
• It is full-auto rated with no barrel restrictions, according to Dead Air.

Frequently Asked Questions

What mount does this Sandman X use? This version uses the KeyMo quick-detach mount and ships with a KeyMo adapter, a 5/8-24 flash hider and a TL tool pack. Dead Air also sells the Sandman X with a Xeno mount.

Do I need ATF approval to buy this? No. As of October 9, 2026, ATF no longer requires Form 4 approval, registration or a tax stamp for suppressors. It transfers on a Form 4473 with a background check through a Class 3 (SOT) dealer. State and local laws still apply.

What rifles is it rated for? Dead Air rates it up to .300 RUM with a 4200 ft-lb energy ceiling and no barrel restrictions, for semi-automatic and bolt-action rifles alike.

Buy the Dead Air Sandman X KeyMo Suppressor, .30 Caliber, FDE

As of October 9, 2026, this suppressor transfers on a Form 4473 with a background check at your Class 3 (SOT) dealer, with no Form 4 or tax stamp; state and local laws still apply. Order through Dead Air‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer. The KeyMo mount lets one Sandman X move between rifles in seconds, so it can serve a carbine and a bolt gun alike.