How does the spring move without the rounds in it?
If it doesn't seem to catch and moves just fine, the BB's might be the culprit. They should have a rather smooth surface. I recently had a problem with some questionable .25g that had a rather rough exterior and it made the BB's jam in my mag. I suspect that you have the same problem.
I have never heard of anyone needing to oil that part of there mag before, but I doubt it could hurt if nothing else is working. Just go lightly, maybe a Q-tip with just a drop of silicon on it.
It will also help a lot it you always make sure that the rounds are stacked properly. It can make the mag or the gun jam if they are not, and you get the added bonus of more shots that way. :-D
Best of luck with your problem.
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