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Discussion Starter · #1 · (Edited)
Ok I got the barrel in from Kameron and tested all of the muzzle devices that we currently carry. This was tested on a 16" SCAR 17 barrel. I put down that it fits if it would contact the shoulder and could be timed using SilencerCo shims. All shims should be the same but I put that in there as a disclaimer. The muzzle device gets a NO if it either does not make contact with the shoulder or hits the muzzle face before the shoulder. This should help to determine what you can and cannot use for muzzle devices.
One more disclaimer with the muzzle devices that I listed as good I was able to torque and have even pressure around the shim. If the shim is un-even it could cause issues with the muzzle device being bore concentric. Some people have had issues due to uneven pressure around the shim. Several people have been able to use the face of the barrel and rockset to attach the muzzle devices with success. However in our experience we have seen issues where this causes the muzzle device to come loose over time. So use this information at your discretion.

20141209_175001.jpg

Saker Trifecta Flash HiderYes
Saker Trifecta Muzzle BrakeYes
Specwar Flash HiderYes
Specwar Muzzle BrakeYes
Griffin CompensatorYes
Griffin RSTAYes
Surefire SOCOM Flash Hider (using their spacer)Yes
Surefire SOCOM Muzzle Brake (using their spacer) Yes
Thunder Beast Brake (original) No
Thunder Beast CB BrakeNo
Thunder Beast Flash HiderNo
AAC 51T Flash Hider (deep socket)No
AAC 51T Muzzle BrakeYes
AAC 51T BrakeoutYes
AAC 51T Brakeout 2.0Yes
AAC 90T Flash Hider (MK-13, Titan)No
AAC 90T Muzzle Brake (MK-13, Titan)No
YHM Phantom Flash HiderYes
YHM Phantom Muzzle BrakeYes
YHM LT Flash HiderNo
YHM LT Muzzle BrakeNo
Gemtech Jake BrakeNo
Gemtech VortexNo
AAC 90T Brake (SR-7)Yes
AAC 90T Flash Hider (SR-7)Yes
AAC 90T Brakeout 2.0 (SR-7)No (according to AAC)
 

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Thanks for the report! Excellent job Jeremy.
 
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Ok I got the barrel in from Kameron and tested all of the muzzle devices that we currently carry. This was tested on a 16" SCAR 17 barrel. I put down that it fits if it would contact the shoulder and could be timed using SilencerCo shims. All shims should be the same but I put that in there as a disclaimer. The muzzle device gets a NO if it either does not make contact with the shoulder or hits the muzzle face before the shoulder. This should help to determine what you can and cannot use for muzzle devices.

View attachment 33893

Saker Trifecta Flash HiderYes
Saker Trifecta Muzzle BrakeYes
Specwar Flash HiderYes
Specwar Muzzle BrakeYes
Griffin CompensatorYes
Griffin RSTAYes
Surefire SOCOM Flash HiderNo
Surefire SOCOM Muzzle BrakeNo
Thunder Beast Brake (original) No
Thunder Beast CB BrakeNo
Thunder Beast Flash HiderNo
AAC 51T Flash HiderNo
AAC 51T Muzzle BrakeYes
AAC 51T BrakeoutYes
AAC 51T Brakeout 2.0Yes
AAC 90T Flash HiderNo
AAC 90T Muzzle Brake No
YHM Phantom Flash HiderYes
YHM Phantom Muzzle BrakeYes
YHM LT Flash HiderNo
YHM LT Muzzle BrakeNo
Gemtech Jake BrakeNo
Gemtech VortexNo
What are the negative effects of the flash hider contacting the muzzle face compared to the shoulder? I am running a Surefire SOCOM flash hider and have not noticed any ill effects.
 

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Discussion Starter · #4 ·
There are two things that could happen. The flash hider might not be bore concentric or it might come loose while firing. Not saying that it would happen just that it could. For the purpose of the test it was to show what works for sure without modifications.
 

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Discussion Starter · #6 ·
Isn't the AAC 50t Flash hider suppose to contact the muzzle face and not the shoulder to work properly?
It depends on who you talk to at AAC. Some say yes some say no. For the purpose of this I just did it based on the shoulder since I know that will work for sure.
 

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It depends on who you talk to at AAC. Some say yes some say no. For the purpose of this I just did it based on the shoulder since I know that will work for sure.
Seems like AAC cant get their act together when it comes to Scar17 mount questions. first it was ok to use the brakeout2 then it wasnt , then you should use the flash hider then that is not safe. Guess if you want to mount a AAC can on a scar 17 you have to take the chance of baffle strikes regardless of mount
 

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Seems like AAC cant get their act together when it comes to Scar17 mount questions. first it was ok to use the brakeout2 then it wasnt , then you should use the flash hider then that is not safe. Guess if you want to mount a AAC can on a scar 17 you have to take the chance of baffle strikes regardless of mount
I agree, ALL I have ever seen AAC say was the flash hider was the only safe mount, then they said the Brakeout 2.0 was OK and then a short time later that say again ONLY the flash hider is the safe one. :?:

I'll stick with the flash hider on mine, it's been fine for better than 5K 762-SD suppressed so far.
 

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I purchased a AAC 7.62-SDN-6 with a 51T Flash Hidder and in the process of the transfer right now. Will this work on my SCAR 17? I also plan on get a 13 inch barrel and using this can on it also.

Thanks,
 

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Discussion Starter · #12 ·
Based off of this latest test I would not recommend it. I would go with the brakeout.
 

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Thanks for the testing - and agree on the AAC Flash hider (which I am getting to move away from on my 13" 17 barrel) I would rather have concentric and shoulder than concentric/maybe concentric and touching the barrel face due to a imperial thread

Just had a long talk about this - and how a metric thread can overcome most issue than that of a imperial thread

Also - I believe AAC on their muzzle devices use a 45 degree angle thread for lead-in - SilencerCo uses a 30 degree lead in ...

We need a few more machinist in this posting to maybe help clear the muddy waters (SS your comments please)

Maybe even make a sticky for barrel threads/blueprints and muzzle devices w/blueprints (Mods your input here please?)

And Merry Christmas Everyone! All we want is a muzzle device that can do it all and concentric barrel threads so we don't have a baffle strike... ;)
 

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Would really like to hear from Nick at AAC on this issue. I've been using the 51T mount with an SDN-6 for about 6 months and it has been a successful setup. I just picked up my SR-7 to put on my 17s SBR so that the SDN-6 could be on my MPW full time once I take possession of it in January. Both 51T and 90T flash hiders are not recommended based on SilencerShop's recommendations. Is there some way for AAC to reconcile all the conflicting information?
 

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Thanks for putting this together. Can you post detailed pictures of the shims you used for this test? Did you actually get the brakes to time correctly using shims?

I have had no problems getting the brakes and flash hiders for the Silencerco Specwar 762 and Saker 762 to shoulder up directly to the 17 barrel w/out shims. Those all fit fine.

However the AAC shims definitely will not work to time the Saker 762 brake or Specwar 762 brake as I have tried it myself on 2 different barrels. I haven't gotten any Silencerco shims with any of their brakes so I don't know if they are different than the AAC shims.
 

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Discussion Starter · #18 ·
Would really like to hear from Nick at AAC on this issue. I've been using the 51T mount with an SDN-6 for about 6 months and it has been a successful setup. I just picked up my SR-7 to put on my 17s SBR so that the SDN-6 could be on my MPW full time once I take possession of it in January. Both 51T and 90T flash hiders are not recommended based on SilencerShop's recommendations. Is there some way for AAC to reconcile all the conflicting information?
We only sell the deep pocket 51t flash hider. The standard flash hider should work but I didn't included it since I couldn't test it myself. For the 90T it will contact the muzzle face before the shoulder. For the purpose of this test that was a no go due to some complaints by customers of the muzzle devices coming loose when in contact with the barrel face.
 

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Discussion Starter · #19 ·
Thanks for putting this together. Can you post detailed pictures of the shims you used for this test? Did you actually get the brakes to time correctly using shims?

I have had no problems getting the brakes and flash hiders for the Silencerco Specwar 762 and Saker 762 to shoulder up directly to the 17 barrel w/out shims. Those all fit fine.

However the AAC shims definitely will not work to time the Saker 762 brake or Specwar 762 brake as I have tried it myself on 2 different barrels. I haven't gotten any Silencerco shims with any of their brakes so I don't know if they are different than the AAC shims.
I used the standard shims that SilencerCo includes with their brakes. They seem to be closer to the threads than the other shims that I tested that is why I used them. For the Brakes I used shims and I did not use shims on the flash hiders. I was able to actually time the brake using the shims. I took a picture the SilencerCo shims are on the top and the AAC is on the bottom.
20141212_101251.jpg
 

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Would really like to hear from Nick at AAC on this issue. I've been using the 51T mount with an SDN-6 for about 6 months and it has been a successful setup. I just picked up my SR-7 to put on my 17s SBR so that the SDN-6 could be on my MPW full time once I take possession of it in January. Both 51T and 90T flash hiders are not recommended based on SilencerShop's recommendations. Is there some way for AAC to reconcile all the conflicting information?
There is an extensive discussion with Nick about this. Search for the thread.
 
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