Dead Air Keymo Deadair Da429 Keymo "s" Mount

The Dead Air Keymo DA429 "S" Mount is a quick-detach adapter that lets you swap your SilencerCo ASR-equipped suppressor between rifles without tools or permanent installation. If you run Dead Air Armament muzzle devices—brakes or flash hiders—and want the flexibility to attach and remove your suppressor by hand, this adapter bridges that gap by replacing your existing ASR QD mount. It's built for shooters who want modular suppressor setups without the hassle of staking, re-timing, or re-zeroing on every rifle in the safe.

The Keymo system is purpose-built for one-hand operation: attachment and removal take seconds, making it practical on the range, in the field, or when switching between rifles. Because it doesn't require staking to the muzzle device, you get a non-permanent solution that respects the integrity of your barrels and muzzle hardware. This adapter also opens up routing options—you can run your suppressor under the handguard on some setups, giving you flexibility in mounting location that fixed or permanently staked systems don't offer.

Dead Air Armament engineered this mount specifically for their brake and flash hider lineup, so fit and repeatability are dialed in. If you already own a SilencerCo ASR suppressor and are building or upgrading rifles with Dead Air muzzle devices, the Keymo DA429 "S" gives you a way to share that suppressor across your collection without duplicating hardware.

Key Features

• Quick-detach adapter compatible with SilencerCo ASR-equipped suppressors
• Mounts on Dead Air Armament muzzle brakes and flash hiders
• One-hand attachment and removal—no tools required
• Non-staking design preserves muzzle device integrity
• Enables flexible mounting options, including under-handguard placement on compatible platforms
• Modular setup allows one suppressor to move between multiple rifles

Frequently Asked Questions

Will this work with my SilencerCo ASR suppressor?

Yes. The Keymo DA429 "S" Mount is designed to accept SilencerCo ASR-equipped suppressors. You'll replace your existing ASR QD mount with this adapter to attach to your Dead Air muzzle device.

What muzzle devices does the Keymo DA429 fit?

This adapter is engineered for Dead Air Armament muzzle brakes and flash hiders. It will not fit other manufacturers' devices.

Do I have to stake this mount to my muzzle device?

No. The Keymo system is designed as a non-staking solution, so your muzzle device remains unchanged and can be removed or swapped if needed.

Can I use this for under-handguard suppressor mounting?

Yes. The Keymo design allows you to route your suppressor under the handguard on compatible rifle builds, giving you routing flexibility that staked systems typically don't provide.