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Only problems I've had with KSC rubber swelling from too much oil is the M11 hop up rubber and the ones on the mags. My G19 mags (all six of them) and both my G19s are still fine.
For the original poster, what weight BB are you using? Why not go to a heavier BB (I've used up to 0.43g very well in my G19) if you are unable to 'dry out' your hopup rubber?
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