Quoted:
AK-47 + CAN = Baffle Strike!!! I don't care who cuts the threads on these guys, you are looking for a bad day at the range. Most (not all) AK barrels are made of cheap material. I have seen a barrel with good threads send a round through the baffles of a YHM Phantom. IMO it is because of the whip on the barrel with rapid fire. I watched a shooter shoot a mag+ with single shots and then he put a new mag in and decided to rapid fire it...BAFFLE STRIKE! On top of that, the AK is not a good host due to how loud it is. General rule of thumb for me is to keep a can off of the AKs. If you went out and spent some money an a high quality AK, maybe, but otherwise I wouldn't. That is just my $.02. Do what you wish.
@ the OP:
I have a WASR-10 & a YHM Phantom with over a thousand rounds and no baffle strikes. What did I do when I first got my mount? I installed it, eyeballed it, and when I was comfortable with it I fired a round to verify and check for signs of a strike. After that, I fired three rounds and rechecked. Then it was five, and finally I started plinking as normal. I wanted to run the mount on my AMD-65 pistol, but the threads were too deep and looked off-center so I didn't risk it. I will say I tightened that mount down *really really really* tight and check it every time before I shoot. As I recall, YHM's mount doesn't lock into the plunger so it could work itself loose over time.
How to check threads - either send it to a smith or check and see yourself? I'm not sure what you're asking. If your threads aren't concentric, it's probably cheaper to buy another AK than to find a new barrel, find one long enough without threads to be chopped, and have the new barrel installed. I don't know what other options you have besides making a standard AK an SBR & moving back the FSP.
Why is an AK a poor host? Because it looks like kill your babies evil?
I get a *lot* of blowback when I run mine suppressed. It's much filthier than an AR-15 SBR with the same suppressor on a 10.5" barrel. Sights are standard AK sights, recoil is standard AK recoil, but she blows out a lot of gunk. It's a little long and front heavy, but that's not really an issue. The blowback is the real PITA.
Here's a teaser for you: