Advanced Armament Corp. 51T Blackout Flash Hider - 1/2x28

Manufactured by Advanced Armament Corp
SKU: 100206
MPN: 64141
Manufactured by Advanced Armament Corp
12 Reviews

Out of Stock

NOTE: Limit 5 per household. Quantities exceeding 5 will not allow checkout.



The BLACKOUT flash suppressor is the most efficient design available. The proprietary features eliminate muzzle flash, even on CQB-length barrels. The BLACKOUT is inherently stronger and more impact resistant than four prong designs, while not being subject to the rapid erosion of closed-ended units. A high strength corrosion-resistant aerospace alloy, and ultra-hard SCARmor finish provide the highest level of durability. Military tested and selected.
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BrandAdvanced Armament Corp.
Manufacturer.Advanced Armament Corp
MaterialSteel - 17-4 PH Stainless
Suppressor MountAAC 51T Ratchet Mount
Thread Pattern1/2 X 28
TypeFlash Hider
Weight4.3 Oz

WARNING: Discharging firearms in poorly ventilated areas, cleaning firearms or handling ammunition may result in exposure to lead and other substances known to the State of California to cause birth defects, reproductive harm and other serious physical injury. Have adequate ventilation at all times. Wash hands thoroughly after exposures. For more information, see

Ratings & Reviews

12 reviews

  • 3 stars
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quality part


Easy install , looks so aggressive and works awesome



Got to try this FH out yesterday at the range.. I gotta say I like it a lot.. Wouldn't mind buying another one for my 300blk out build..



great transactions and fast shipping will definitely buy from them again

As promised, and a quality product


I use a 51T for suppressor mounting and have found it an absolutely solid piece of equipment. I needed one for another rifle and found it in stock at Primary Arms at a price that was the most competitive of other leading sites that did not have inventory. The item shipped out with exceptional speed, and I received it in no time.The quality of the product matches the quality of service I've gotten from Primary Arms. Thanks to all.

Prefect flash hider, but...


I use aac sdn6, so little choice. No flash what so ever, but there in the infamous PING!

thanks primary arms


out of stock most places and found it here. great price and fast shipping. placed my order on friday and it shipped the same day. arrived on monday. i will deffinately order from them again.

Great product


Really nice firm flash hider, solid functional and very aggressive.



They sent me the right item, fast. the hider is in perfect condition and exactly what I expected from AAC

pice and service


usually I can find items like this AAC flash hider cheaper on here than the factory and shipping is great, I live in Alaska and some places think that is a foreign country, Thanks again Primary Arms

No Shims in the Package

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Please Note: Purchased 2 and neither came with the Shims.<br>Great product other than without shims your will most likely have to purchase them separately to use.

Good kit

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As with any AAC product I own, the Blackout FH is rock solid kit and you could probably break rocks with it. While the Blackout doesn’t necessarily need to be timed, I used some left over shims from a AAC Brakeout 2.0 to get the slots to line up at 10:00, 2:00 and 6:00.

Test fit first...

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I've purchased multiple AAC muzzle devices and haven't had any issues. This was a very rare instance and, I feel, more my fault than AAC's.
<br>Bought this for a new built, tried threading it on and it seemed to get too tight, too quickly. I removed it and tried an old Brakeout I had and it threaded up just fine, so the barrel threads were okay. Long story short, the threads were too shallow on the Blackout, ended up getting galled up on my barrel and had to cut it off with a grinder and a Dremel.
<br>Bought a 1/2 x 28 tap and die and chased the threads on the barrel. Most of the mess cleaned up okay and I installed the old Brakeout.
<br>Just a warning to others, who probably have more sense than me... If it binds/tightens up too soon, don't force it. Chase the threads with a tap or return it for another one.