Yeah, upon the pic and further pondering, I think the depressed areas would still be solid enough to support the corner bend.
Worst case scenario would be the machined corner cracking on every other external flat area.
Any welding of cracks would need to be low temp, localized, allowing time to cool.
Certainly not suggesting to run a full length bead, nonstop, end to end.
I too am sorry to hear that there is a problem w/ these receivers.
Yes, these seem to be the best available and I was hoping they would be right on the money correct w/no issues.
Not picking on WLA's. Being a hobby fabricator, bending, welding and machining a item and having it come out just right sometimes seems a nightmare. You shoot for 100% and if you get 96, that may just be the way it is.