HK417 and DeadAir Keymount Muzzle Brake silencer ready space issue

5964 Views 15 Replies 4 Participants Last post by Chopstix Kid, Jan 1, 2017

powermouse

Discussion Starter · Dec 19, 2016

2

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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1 - 16 of 16 Posts

4C Dragon

· #2 · Dec 19, 2016

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

powermouse

Discussion Starter · #3 · Dec 19, 2016 (Edited)

4C Dragon said:
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.

Chopstix Kid

· #4 · Dec 19, 2016 (Edited)

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.

powermouse

Discussion Starter · #5 · Dec 19, 2016

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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gopherboy128

· #6 · Dec 19, 2016

Is there any particular reason you arent using a flash hider threaded M15x1?

https://deadairsilencers.com/product/flash-hider-3/

Available on backorder. Thread it on, torque it down and be done with it.

powermouse

Discussion Starter · #7 · Dec 19, 2016 (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..

powermouse

Discussion Starter · #8 · Dec 30, 2016

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

gopherboy128

· #9 · Dec 30, 2016

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.

Chopstix Kid

· #10 · Dec 30, 2016

powermouse said:
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.

Chopstix Kid

· #11 · Dec 30, 2016

gopherboy128 said:
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.

gopherboy128

· #12 · Dec 31, 2016

Chopstix Kid said:
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.

Chopstix Kid

· #13 · Dec 31, 2016

gopherboy128 said:
We'll see. Have a feeling it will be the flash hider, but maybe not.

I called Gary. It's a FH.

powermouse

Discussion Starter · #14 · Dec 31, 2016

Dead Air already have a flash hider in M15. i was talking about muzzle break.

gopherboy128

· #15 · Jan 1, 2017

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

Chopstix Kid

· #16 · Jan 1, 2017

powermouse said:
Dead Air already have a flash hider in M15. i was talking about muzzle break.

They are not releasing an M15x1 muzzle brake.

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