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3/23/2015 4:21:03 PM EDT
Last week I bought a Chinese MAK-91 (milled).  Some numbnut had threaded the muzzle and put some sort of weird muzzle device on it; supposed to be a flashhider, I guess.  Anyway, I wanted to change it out and learned to my chagrin that it appears to be a screwy (pardon the pun) thread size that I can't figure our nor find a reference to....much less a selection of muzzle devices.

As close as I can measure, it's a 14 x 1.5 RH thread, which I've never heard of.  Does anyone know about this size, or (recognizing the distinct possibility that my measurements were not precise), what size it could actually be?  The things I can say for certain are that the thread pitch is greater than 1 mm and that it is a right-hand turn.
Thanks.
3/23/2015 4:37:10 PM EDT
[#1]
AKs are supposed to be threaded 14x1 LH

There are 14x1 RH muzzle devices:

CNC Warrior

Otherwise, I'd suggest getting it re threaded to 1/2x28
3/23/2015 7:25:36 PM EDT
[#2]
I think some FALs have a 9/16" thread. Not sure if left or right hand. Pretty close to 14mm.

Metric guns may be left and inch, right, or the opposite.
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