H&R M65 magazine question

[StratA]

The one came with it is correct and the other three aren't. That's why they don't fit. Close but no cookie. I've lapped magazines like these for fit and have been successful but you need to reblue after. I had five for a Beretta 950b that four fit and one was overtight. I lapped the side with emery paper and worked it until it dropped out and it remained silver until I sold it. Like these, looked good but didn't fit. They were slightly different in construction too... It's usually just a couple of spots you have to reduce in size.

They also made the H&R 800 Lynx Cal .22LR with the same type of mags for instance...

Thanks! I'll try that. If it doesn't work I'm not losing much on the spare mags.