Lubricant adheres to dust and dirt which makes for more fouling in your mags down the road.
Be careful filing away in the mag finger areas. Take a bit too much mat'l off and you'll get a lot of double feeds.
If you note that all of the bbs are rattling around loose when your mag jams, then the follower is jammed. You can file down the sides of the follower a bit to fix this.
If some of the bbs are loose with a bunch of bbs piled up against the follower and a bunch above that are loose, then a bb is jammed in the passage. I suspect some dirt or sand is binding one bb which is holding up the follower and other bbs. Remove the baseplate and scrupulously clean the bb channel with qtips.
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