This is pretty old news, stemming from an incident several years ago in Europe.
At any rate, silica BBs (Bioval clear, Madbull/BBBastard Silica) are pretty much banned from most games.
There are many excellent quality non-silica BBs available so regardless of the debate surrounding the silica BBs there's no reason to risk it. (actually BB Bastard had a video on Youtube, destroying a greenhouse with them; it may still be around).
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