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Blackout Defense Keymo Flash Hider Up to 10% Off w/ Free Shipping — 4 models

Special offer available for this product. Click here to see!
Blackout Defense 1/2-28 Keymo Flash Hider, H900, Bronze, MUZZLE-1/2-KEYMO-FH-H900
Blackout Defense 5/8-24 Keymo Flash Hider, Black, MUZZLE-5/8-KEYMO-FH-BLK
Blackout Defense 1/2-28 Keymo Flash Hider, H900, Bronze, MUZZLE-1/2-KEYMO-FH-H900
1 of 2 images
Blackout Defense 1/2-28 Keymo Flash Hider, H900, Bronze, MUZZLE-1/2-KEYMO-FH-H900
Blackout Defense 5/8-24 Keymo Flash Hider, Black, MUZZLE-5/8-KEYMO-FH-BLK
2 of 2 images
Blackout Defense 5/8-24 Keymo Flash Hider, Black, MUZZLE-5/8-KEYMO-FH-BLK

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Questions & Answers
What’s the bore size of this flash hider?

1/2-28 bore diameter 8.50mm (.334”)
5/8-24 bore diameter 9.0mm (.354″), Not for use with 9mm ammunition

by Peeps, Verified Owner, February 2, 2026
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4 Models Available
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ATTENTION! We currently do not ship this product to CA, IL, NY, WA , and U.S. Territories. Please see our policies for more information.

Product Info for Blackout Defense Keymo Flash Hider

They are officially licensed and approved by Dead Air Silencers to incorporate their KeyMo mount design with their muzzle device designs. The KeyMo Flash Hider is compatible with Dead Airs KeyMo-equipped silencers.image

Specifications for Blackout Defense Keymo Flash Hider:

Manufacturer: Blackout Defense
Finish: Nitride
Fabric/Material: 17-4 Stainless Steel

Features of Blackout Defense Keymo Flash Hider

  • In-house heat treated to condition H900 for a through-hardness of 45-47 HRC
  • 17-4 stainless steel that is heat treated to condition H900 exhibits 14% higher ultimate tensile strength over hardened 4140 steel
  • Every 90 degree corner is machined with undercut profiles to improve seal and engagement with the suppressor
  • Closed-prong design reduces flash and eliminates tuning-fork ping

Package Contents:

  • Blackout Defense Keymo Flash Hider
  • Shim kit

Blackout Defense Keymo Flash Hider Orderable Models

List of Orderable Models

  • Blackout Defense 1/2-28 Keymo Flash Hider, Black, MUZZLE-1/2-KEYMO-FH-BLK , MPN: MUZZLE-1/2-KEYMO-FH-BLK , UPC: 850023922427 , Code: 4Q9-BFH-TB12-MUZZLE-1-2-KEYMO-FH-BLK
  • Blackout Defense 5/8-24 Keymo Flash Hider, Black, MUZZLE-5/8-KEYMO-FH-BLK , MPN: MUZZLE-5/8-KEYMO-FH-BLK , UPC: 850023922489 , Code: 4Q9-BFH-TB12-MUZZLE-5-8-KEYMO-FH-BLK
  • Blackout Defense 1/2-28 Keymo Flash Hider, H900, Bronze, MUZZLE-1/2-KEYMO-FH-H900 , MPN: MUZZLE-1/2-KEYMO-FH-H900 , UPC: 850023922434 , Code: 4Q9-BFH-TB12-MUZZLE-1-2-KEYMO-FH-H900
  • Blackout Defense 5/8-24 Keymo Flash Hider, H900, Bronze, MUZZLE-5/8-KEYMO-FH-H900 , MPN: MUZZLE-5/8-KEYMO-FH-H900 , UPC: 850023922496 , Code: 4Q9-BFH-TB12-MUZZLE-5-8-KEYMO-FH-H900
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