On my .22 Goldstar the first generation new mag went in but would not operate.

When removed there was a mark on the bottom of the mag where the index pin hit it.

I removed a small piece of the plastic where the mark was and it worked really well!

I sold the gun and the mag is still working.

I don’t know if the latest new mags will work.

I will look through my BSA mags today and see if I can reach any further conclusions.

I also removed the index lever from my Stalker S10 and that works with the new mags.