Quote Originally Posted by Delkal View Post
Why would you want to do that? Get a longer barrel with a standard flash hider and you will have more velocity and less noise/muzzle flash.

And the BATF rules for pinned and welded are clear and the answer is all over the internet. Why are you asking us?
Not easy or always possible to do a quick, cheap barrel swap on an AK or other types of non AR pistols so there’s that. I also don’t understand why the question cannot be asked here.