The Dead Air KeyMo Muzzle Brake (brand part number DA104) is a 338-caliber muzzle device machined from 4140 heat-treated alloy steel, finished in Black Nitride, and threaded M18X1. Dead Air built the KeyMo Muzzle Brake on the same quick-attach platform found across its KeyMo lineup, so it doubles as the mounting foundation for a KeyMo-equipped Sandman-series suppressor while still functioning as a standalone precision brake. Large-bore .338 shooters get a muzzle device that tames recoil on its own and locks a suppressor into place in seconds when it is time to run one.

Key Specifications

• Threaded M18X1 for .338-caliber threaded barrels.
• Rated for .338 caliber projectiles.
• Machined from 4140 heat-treated alloy steel for durability.
• Finished in Black Nitride for wear and corrosion resistance.
• Built on the KeyMo quick-attach platform shared across Dead Air’s KeyMo lineup.
• Doubles as the mounting foundation for a KeyMo-equipped Sandman-series suppressor.
• Functions as a standalone muzzle brake before a suppressor is added.
• Weighs approximately 0.26 lb, adding minimal mass to the muzzle.

Frequently Asked Questions

Does this brake work without a suppressor? Yes, it functions as a standalone muzzle brake and doubles as a KeyMo mounting foundation when you add a suppressor.

What caliber is it rated for? .338 caliber.

What thread pattern does it use? M18X1.

Buy the Dead Air KeyMo Muzzle Brake, .338 Cal

Tame recoil on a large-bore build with a brake that is ready for a KeyMo suppressor. Order it from our Class 3 parts and accessories selection at our Lubbock, Texas gun shop for fast, direct shipping.