I'm not saying it's not possible, and please don't take this as some sort of personal attack. You said you did one later that came out perfect, correct? The jig didn't change. So what was different? Keep in mind, everyone and their brother is selling 80% lowers, but there are only two or three companies that are manufacturing them (that I know of), and if it is a manufacturer's defect (the casting), there could be untold thousands of them out there.
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My bad man. I wasnt trying to sound like a dick. Thats correct though. The one that does not have a hole measures .07 wall thickness from the magwell. It could have been me. Im by no,means a machinist. I used noreen forged and Anderson who I believe is cerro. Thunder tactical? I have no idea who does those.