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Discussion Starter · #1 ·
Hi I tried to install on HK MR762 a Dead Air Silencers a Keymount Muzzle Break to make a Sandman S ready.
but it ended up that HK has a space between end of barrel and threads.

so when I place a new muzzle break there is a space around 7.30mm or 0.287in and adjustment rings are floating there LOL
the inner diameter approx. 16mm / 0.630 in

I attached images just to get an idea what I am dealing with.

Calipers Technology Measuring instrument Tool Machine Technology Electronic device Finger

any suggestions for a solution (don't want to go to gunsmith)
 

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The barrel needs a relief cut at the end of the threads to the shoulder and a sharp 90 degree edge. I have found this the case on many barrels. Once the threads stop the machine rolled up to the shoulder. Using a FH this is ok, but when attaching a suppressor or QD FH you cannot tighten up to the shoulder. If you cannot tighten to the shoulder you will loose concentric to bore and risk baffle strike. Also, you cannot properly set a QD FH. I recommend sending your Upper to a smith and have them relief cut your thread to shoulder area.

You could send you QD FH or suppressor and have a relief area cut at the beginning of threads.

Let us know what you do
 

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Discussion Starter · #3 · (Edited)
The barrel needs a relief cut at the end of the threads to the shoulder and a sharp 90 degree edge. I have found this the case on many barrels. Once the threads stop the machine rolled up to the shoulder. Using a FH this is ok, but when attaching a suppressor or QD FH you cannot tighten up to the shoulder. If you cannot tighten to the shoulder you will loose concentric to bore and risk baffle strike. Also, you cannot properly set a QD FH. I recommend sending your Upper to a smith and have them relief cut your thread to shoulder area.

You could send you QD FH or suppressor and have a relief area cut at the beginning of threads.

Let us know what you do
i contacted DeadAir if they might have a solution.
i was thinking if there is a some ring or halfthreaded ring to cover the gap, but looks like i cant avoid gunsmithing.

P.S. this FH is designed to QD supressor on itself.

:frown: Thank you.
 

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You have a Dead Air mount in M15x1? I was just told by them that those are still in production.

For reference, metric threaded muzzles are intended to bottom against the muzzle, not a barrel shoulder. This design is not conducive to muzzle brakes unfortunately since you can not use shims to time it.

You need you purchase the mount that is SPECIFICALLY made for HK M15x1 muzzles.
 

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Discussion Starter · #5 ·
thank you, Chopstix Kid. for valuable info.

there are 2 the breaks got. https://deadairsilencers.com/products/keymount-muzzle-brake/
these breaks are design to QD for Sandman L/S silencers.

DeadAir issues in 2 standards: 1/2x28, 5/8x24 (for 223 and 308 calibers)
5/8x24 - threaded perfect and it surprisingly fited on barrel threads. but because there is a bump on HK barrel next to threads it cant go full way to the barrel shoulder edge and it leaves a gap between..

i installed on Rem 700 LTR .308, and want to install on HK MR762A1, to be able to swap a silencer between two.
the muzzle has holes on top which perfectly stabilize the rifle on recoil and vertical jump.

in addition, i can add some converter such is (this one is too short also) M15x1 RH to 5/8-24 RH Thread Adapter

but i think the most solid solution in this case is to go to gunsmith.(which i try to avoid)
i want to wait until reply from DeadAir. (in case they might made the Metric one for HK)

P.S. the Sandman L or Sandman S are designed to QD on Keymount FH.
 

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Discussion Starter · #7 · (Edited)
yes, i can get in M15x1, but i like how Keymount Break stabilizing and reducing recoil.
P.S. up to today i did not know i need a M15x1 instead of 5/8-24. (PERSONAL THANK YOU: Chopstix Kid)

and it looks short, that will have same issue with gap on barrel next to threads..
 

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Discussion Starter · #8 ·
i spoke with DeadAir. they are so awesome. they are manufacturing right now the new M16 RH Muzzle break specifically designed for HK. I am so happy i don't have to re-thread my rifle. 3-4weeks to wait
 

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Do you mean they are manufacturing a M15x1RH muzzle brake? Sorry, but you get your thread pitches mixed up, and it does make a difference, as the HK MK23 .45ACP pistol HAS M16x1RH threads, so it could lead to confusion.

That aside- I did not know Dead Air was offering their brake in M15x1, I thought it was only their flash hider. Interesting.
 

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yes, i can get in M15x1, but i like how Keymount Break stabilizing and reducing recoil.
P.S. up to today i did not know i need a M15x1 instead of 5/8-24. (PERSONAL THANK YOU: Chopstix Kid)

and it looks short, that will have same issue with gap on barrel next to threads..
You are very welcome.
 

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Do you mean they are manufacturing a M15x1RH muzzle brake? Sorry, but you get your thread pitches mixed up, and it does make a difference, as the HK MK23 .45ACP pistol HAS M16x1RH threads, so it could lead to confusion.

That aside- I did not know Dead Air was offering their brake in M15x1, I thought it was only their flash hider. Interesting.
This. If indeed they are manufacturing a brake, I am curious if the guys will include muzzle shims. I'm not a big fan of muzzle shims. I suspect that the op means flash hider. Oh the modern day M15x1 blues.
 

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This. If indeed they are manufacturing a brake, I am curious if the guys will include muzzle shims. I'm not a big fan of muzzle shims. I suspect that the op means flash hider. Oh the modern day M15x1 blues.
We'll see. Have a feeling it will be the flash hider, but maybe not.
 

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I havent heard they plan on releasing a muzzle brake in M15x1RH. So far they have only said flash hiders would be M15x1RH.
 

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