Well your O-rings aren't made of BBs, And you're not soaking your BBs in silicone when you shoot, so that test proves nothing.
Like I've said twice, if there's petroleum in the silicone and it eats your O-rings, you can just buy new and better O-rings that are petroleum resistant. They're not airsoft parts, they're O-rings, so there should be no problem importing them.
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