I would not use any oils on your magazines. What I would recommend is disassemble the magazine. I use MPRO7 cleaner and a rag to thoroughly clean the mag. Then wipe dry with another cloth. I would use a mag brush, dry, to clean out the interior of the magazine and spring. My magazines look and perform like new. You do not have to do it every time with 50 to 100 rounds, but anything beyond that, I would surely clean them as stated above in detail. The magazines should be dry when ready to use. Again, just a simple mag brush is all you need to overcome most of the cleaning on your mags.

Nick

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NRA Instructor\GCA Gunsmith