The Dead Air KeyMo muzzle brake in 5/8-24 is a full-size, multi-port brake that doubles as the mount for a KeyMo-equipped Dead Air suppressor (Dead Air part no. DA102). Its precision-machined taper and mechanical detent give consistent lockup and a repeatable return to zero each time the can goes on, and the detent resists loosening under heat and vibration. With the suppressor off, the ports keep the rifle flat and fast on follow-up shots. Dead Air says it is especially at home on higher-pressure calibers and shorter barrels, where recoil impulse and precision matter most. This 5/8-24 version has a .30 caliber bore for .308 and 7.62 rifles.

Key Specifications

• The thread pitch is 5/8-24, the standard for .308 and 7.62×51 barrels.
• The bore diameter is .30 caliber, sized for .30 caliber and smaller rifle cartridges.
• Material is 4140 heat-treated alloy steel, built to hold up under sustained fire.
• The finish is black nitride, a hard, corrosion-resistant surface.
• Overall length is 2.82 inches, a full-size brake.
• Weight is 3.90 ounces.
• The mount uses the KeyMo taper with a mechanical detent, for consistent lockup and return to zero.
• The multi-port design keeps the muzzle flat and speeds follow-up shots.
• It has a pre-drilled pin and weld hole at the 6 o’clock position, for barrels that need a permanent attachment.
• A shim kit and timing instructions come with it for indexing the brake.

Frequently Asked Questions

Can I pin and weld it? Yes. Dead Air pre-drills the DA102 with a pin and weld hole at the 6 o’clock position, which is useful for meeting a minimum barrel length.

How do I time it on the barrel? Dead Air includes a shim kit and instructions for timing the muzzle device.

Does it work without a suppressor? Yes. It is a full-size multi-port brake on its own, and it becomes the mount when you attach a KeyMo-equipped suppressor.

Buy the Dead Air KeyMo Muzzle Brake, 5/8-24, .30 Caliber, Black Nitride

A brake that also carries the suppressor saves a swap every time you go from the bench to the field. Order it from our Lubbock, Texas gun shop for fast direct shipping, and look through our Class 3 parts and accessories for mounts and front caps.