Austeyr

Yep - with the mags, the spring pressure from having them fully filled can give issues with the loading fin (and more likely, the C clip pinging off). Yes, the thrust bearing allows the spring to rotate, and helps with a smoother bolt pull and efficient/consistent power delivery.

Honestly, it's worth persevering. The last game that I played with the lee enfield was supremely fun. Super satisfying taking out AEG/HPA players with a bolt action, and you will probably find it pretty accurate and long ranged.

I may take another look at it to be honest. If they're all problematic (As it seems) I may as well fix the one I have and know it's fixed haha. I'm going to recheck the fin piece and make sure it is actually doing its job properly

I rebuilt it this morning as a “I’m bored let’s see” and it works, fired every BB! That’s with the original parts fully, however I’m only getting about 330 fps on a .2g. Prior to the strip and rebuild I was getting 405 fps. That being said though, I have a new spring and metal loading fin on its way today so I can replace the weak parts, then just got to replace the inner barrel with something better. 
 

But, she shoots!