Well, goofy as it sounds AAC does have a "brake'' version in the "blackout" lineup. That's what I got hung up on when I first read the OP. I don't know why they would of changed this because all it does is cause confusion with their products.
Originally I remember AAC and YHM having a pretty similar product. I fact that same friend has a now useless fast attach devise due to what I believe he describe as "patent issues". He has what clearly looks like to the untrained eye, a YHM "phantom" 5.56 fast attach suppressor FH...but it is clearly marked with AACs info of the time.
This part is his wording which may or may not be 100% accurate.
From what he told me, AAC moved to a proprietary thread system and changed the design of the FH to be totally different from the YHM system/style (or the other way around). As it was , AAC had two main options for QD devises. #1 The
Blackout, a QD suppressor attachment that acts as a flash suppressor when a can is not mounted and #2 the
Brakeout a DQ muzzle brake style. Then the system was confused with the addition of the Combo style compensator that was also name the
brakeout The original "brake" MD was included into the "blackout" line and then was divided into two sub categories Brake and Flash suppressor.
See.....clear a soupy mud
like I said not sure if that is all 100% accurate but the end result is the same.
The 51T Blackout Flash hider:
http://www.advanced-armament.com/BLACKOUT-51T-Flash-Hider_p_447.html
The 51T Blackout Muzzle brake:
http://www.advanced-armament.com/Blackout-51T-Muzzle-Brake_p_497.html
And the Brakeout compensator:
http://www.advanced-armament.com/BRAKEOUT-51T-Compensator_p_471.html