We have a class 3 locally that works with Silencerco and they make it very simple. They also offer a "rebate" equal to your tax stamp which takes a little bit of the sting out as long as you don't think about that actual math
The small case is advantageous for powder selection- you aren't trying to make a "full size" case like a 308 be subsonic with all the case fill headaches.
I've always been a fan of the 7.62x39 and this is a natural evolution of that- to disparage a cartridge because it was designed on the other side of the world is beyond ignorant.
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