Well paintball markers use silicone oil as well because of the rubber o rings. Same goes for GBBPs, because of the rubber seals, you need to use silicone oil to preserve them. If you can't find a source of silicone oil, you might want to check out a sex shop for some. Hear me out, because any silicone oil you buy in a sex shop will be safe on rubber and skin because of condoms. I'm not saying this should be the first place to look, but rather as a last resort.
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