Possible, I've fixed a few mags by oiling and working it in. Guess it's the pressure that keeps the seals sealed instead of letting them be in the shape they sit in. Be the mags full or partially, as long as yo uhave some gas in you are ok. I got a brand new G19 mag a while back, it leaked out of the box, did what I suggested, leak went away. Left a KJW M700 mag without gas for about 4 days, completely empty, when I got more propane, I filled it and it gas sprayed out all the cracks in teh backside (where the back end meets the body.) Had to open up, apply gasket sealer, let it sit over ngiht, no problems since.
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