I think it's safe to say that you should write the AMT off your list. I had one of the early single action ones and can safely say that it was a big, steaming heap! It required a punch and hammer to strip for cleaning, even with the SA trigger it was still probably 9-10 lbs pull and it wasn't reliable for anything, even with FMJ ammo. I was lucky to be able to get 3 shots off in a row with it before it failed to feed. I have read that the DAO ones weren't much better. Certainly not something to stake your life on! Not to mention, AMT went out of business several years ago. While I don't know for sure, parts are liable to be scarce and expensive, if they are available at all, should you break something.
Bub