I have a long list of things 'experienced pro shops' have screwed up and sold and then always blamed the customer. In a lot of cases, 'warranty' is no more than just a piece of paper thrown in the box.
If you have the means and ability to blueprint a race engine, it makes it pretty easy to figure out when someone didn't follow the print when machining a firearms receiver.
I fully expect that this particular issue with the receivers will be swept under the rug and never treated as 'warranty', which in my opinion is not the correct way to do business. What nobody knows yet for sure is how many are affected, and which 'channel' they came from. With an open discussion, we, as customers can figure that out. I don't expect any of the importers to participate, that's just the way business works. In reality it's not a safety issue, just a pita.
The first step was pointing out the problem and the second step was resolving it.
For ME the solution was simple but for many people, it won't be so easy and I expect any 'fixes' are just going to be half fixes at best.