Vent holes appear to be small and rigid enough, than again shit happens. All I can say is I've gamed mines for awhile now, playing at a handful of CQB games with some folks shooting slightly hot and I've never had an issue with a BB penetrating the vents in my mask. Been sprayed in the face (no homo) plenty of times and my mask has held up incredibly well. Only minor scratches on the lens, but no BB's getting past it or the vent holes. The only areas of the mask you should be really concerned with is the neck and top of the head area as the masks' design leaves those spots vulnerable.
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