AAC (Advanced Armament) Blackout Fh 90t 5.56mm 1/2x28

The AAC Blackout Flash Hider 90T is a purpose-built muzzle device for 5.56mm AR platforms that cuts muzzle flash without compromise. Designed for shooters who need reliable flash reduction on short barrels—whether you're running a 10.5" SBR for close-quarters work, a mid-length build for 3-gun, or any setup where blast signature matters—this open-end, three-prong design delivers the performance AAC is known for. The 1/2x28 thread fits standard AR platforms and installs with the included Rocksett for a permanent, rock-solid mount.

Built from aerospace-grade steel and finished in AAC's SCARmor hard coat, the Blackout is engineered to handle sustained fire without the wear and erosion that plague closed-end designs. The three-prong architecture is inherently stiffer than four-prong units, meaning less deflection and more consistent performance shot after shot. You get real flash suppression without the fragility of thin-wall designs or the durability concerns of older technology.

This is AAC's no-nonsense answer to muzzle flash on the AR platform—a tool for serious shooters and builders who want effective flash control without chasing trends. Whether you're setting up a home-defense carbine, a duty rifle, or a long-range precision gun that needs a flash hider, the Blackout 90T proves that thoughtful engineering beats hype every time.

Key Features

• Open-end, three-prong design for effective flash reduction and superior durability
• Aerospace-grade steel construction with hard SCARmor corrosion-resistant finish
• Inherently stronger design than four-prong units; resists wear and erosion on short barrels
• 1/2x28 thread compatible with standard 5.56mm AR-platform uppers
• Rocksett threadlocker included for secure, permanent installation

Specifications

Frequently Asked Questions

What AR platforms does the Blackout 90T fit?

The 1/2x28 thread is the standard for 5.56mm AR-15 and AR-pattern rifles. This muzzle device fits any upper receiver with a 1/2x28 threaded barrel, including mil-spec and commercial builds.

Is this a permanent or removable muzzle device?

The included Rocksett threadlocker is designed for permanent installation. Once cured, the muzzle device is locked in place and not intended for frequent removal.

Does the Blackout 90T work on short barrels?

Yes. The open-end, three-prong design is specifically engineered for effective flash reduction even on short barrels, and it avoids the erosion and wear issues common to closed-end designs.

What's the difference between this three-prong design and other flash hiders?

The three-prong architecture is inherently stronger and more rigid than four-prong units, meaning less deflection under fire and more consistent flash suppression. AAC's open-end design also eliminates the durability problems that plague closed-end flash hiders.