So I guess with the general consensus here being that the milled is the more durable version then, can someone wager a guess at what the statement of "milled receivers being more prone to metal fatigue under heavy usage" could be about. I don't know exactly what to make of that, but I've run into it a few times while reading up on this, and like you guys say, milled makes more sense to be the more durable type, yet at the same time "being more prone to metal fatigue" seems to fly in the face of that thought.
Btw. interesting to know that the original Type 1 stamped receiver was as thick as the Yugo/Chinese ones. I thought with there being issues manufacturing the type 1 receivers, that the problem was more because I anticipated them to have started out with the same thickness of receiver as the later AKM's. Also, I'm a little surprised that the walls of the 1.5mm receivers are of the same thickness as the milled ones. I've only handled a few milled ones, but for some reason I thought they were still somewhat thicker, though it's not like it's exactly easy just to eyeball them in comparison to a stamped receiver.