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Old 05-28-2015, 12:32 PM
Paul053 Paul053 is offline
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Default Barrel threading question.

I see on AR barrels they have a shoulder that the threads come up to. I'm assuming that as you torque down on a muzzle device this is what the crush washer or shims meet. What happens without that shoulder? will a muzzle device thread on and as you twist it up the threads will it stop when the threads stop? Or will it continue on the barrel?

I'm looking to get an ak barrel cut, crowned and rethreaded but don't want to pin/weld the muzzle device on. The Barrel itself i still over 16 inches after I cut and rethread. Any solution to this? Or without a shoulder I have to pin/weld? Thanks!
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Old 05-28-2015, 2:41 PM
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kcstott kcstott is offline
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it depends on how the brake is designed,

If the brake is only counterbored and internally threaded the brake will stop either when the threads bottom out or the barrel bottoms out on the brake.

Pining and welding is only needed when the barrel length is under 16" and you muzzle device makes up the difference.

Since we are talking AK's I installed a gas block front sight combo that I made and just used locktite 272 to lock the brake in place. It has yet to move.
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Old 05-28-2015, 2:46 PM
morthrane morthrane is offline
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Just how thin of a barrel do you have that it won't have a shoulder after turning down and threading?

Should probably note which AK style we're talking about, as the majority are detented by the front sight block, not torqued with a crush washer.
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Old 05-28-2015, 10:03 PM
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Quote:
Originally Posted by morthrane View Post
Just how thin of a barrel do you have that it won't have a shoulder after turning down and threading?

Should probably note which AK style we're talking about, as the majority are detented by the front sight block, not torqued with a crush washer.
AK barrels are generally 14mm in diameter out front and the threads that go on them are 14mm diameter, leaving no shoulder.
If he is using a combo gas block with front sight on it, he won't have a front sight near the muzzle to hold a detent.
The solution is to either double-nut the muzzle device or machine it to bottom on the muzzle if it has a shoulder.
If the length is staying at 16" and won't need to be pinned and welded, the muzzle device can just be loctited to the threads.
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Old 06-01-2015, 4:05 PM
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Quote:
Originally Posted by ar15barrels View Post
AK barrels are generally 14mm in diameter out front and the threads that go on them are 14mm diameter, leaving no shoulder.
If he is using a combo gas block with front sight on it, he won't have a front sight near the muzzle to hold a detent.
The solution is to either double-nut the muzzle device or machine it to bottom on the muzzle if it has a shoulder.
If the length is staying at 16" and won't need to be pinned and welded, the muzzle device can just be loctited to the threads.
Double nut? As in threading on a jam nut first then the muzzle device, then backing the jam nut up against the muzzle device? Thanks
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Old 06-01-2015, 6:36 PM
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Quote:
Originally Posted by Paul053 View Post
Double nut? As in threading on a jam nut first then the muzzle device, then backing the jam nut up against the muzzle device? Thanks
Yep
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