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If its something you already have that you're planning on cutting up. Sure give it a try. Heck, cut it in half and test fire a shot into it. If nothing else I suppose it would make a good first line of defence and slow the BB down significantly.
Otherwise just go to the nearest art store and buy a sheet of plexi, for much less than the cost of a screen protector. I had a few sheets of 1/16" plexi that I cut with scissors and an exacto and I feel safe with that.
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