You are going to need a pretty high FPS so break plastic with plastic.
Plastic BBs will deform on contact which dissipates some of their energy, to avoid this and ensure that more energy is being transferred to the target you will have to use silica or metal BBs.
I have no idea what FPS would be needed to acomplish your task as it would depend on the type of plastic, the angle at which you hit it, and a bunch of other stuff.
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