I don't remember the copy magazines being rubbish as such. It's just that the ejectors broke off at a rapid rate. I repaired by tig welding about 15 in quick succession for shooters at my shooting club. In fact I even made up a small jig to hold them in place while they were being tigged. Then got the ejector tag yellow hot and case hardened them. By sheer coincidence, I was asked last week if I could re-tig another 5 including three with lost ejectors.

The fact that the ejectors shear at the weld has absolutely nothing to do with a) the magazine wells not being machined or b).303" extractors being fitted. Quite the contrary because the shallower .303" extractor doesn't exert as much leverage over to the left side as the deeper 7.62mm extractor

In fact, if you could make 500 more, you'd be doing everyone a service and make yourself a lot of money too. But make sure that the ejectors are firmy tigged.

I don't recall seeing anywhere on this site that CO went bust.......... Maybe you could point out where it was said