Welcome to The Armory, where you can find original Adaptive Defense Concepts designs and other useful items we highly recommend.
Unfortunately, we do not accept orders from states where the addition of our products (such as flash hiders) to firearms may conflict with local laws such as California, Connecticut, Hawaii, Illinois, Maryland, Massachusetts, New Jersey, New York, and Rhode Island. It is the responsibility of the purchaser and end user to ensure the use of these products is lawful in their place of residence.
December 2025 NOTE: We are not (and never have been) affiliated with Lucas Botkin’s “Adaptiv Defense.” Adaptive Defense Concepts LLC has been in existence since 2011. Adaptive Defense Armory LLC started in 2020.
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"Rook" Flash Hider
- Description
The Adaptive Defense Armory LLC "Rook" Flash Hider is our own effective 3-prong design. Profiled to minimize harmonic resonance and weight without sacrificing strength, this flash hider weighs in at 2.9 ounces. Machined in Idaho from 4140 steel and black nitride finished, this muzzle device is designed for hard use. The generous cutouts fit most armorer's wrenches for easy removal.
Slots are angled to promote self-tightening. The muzzle cutouts aid in aligning the bore for emergency ballistic breaching of locks, chain, or cable.
Standard 1/2" X 28 TPI fits AR-15's in 5.56/.223/.224 caliber.
Includes crush washer.