Your'e right, polycarbonate is less likely to break than glass so it is superior in that regard. And SureFire glass is 4-5mm thick, my guess is for strength (I'm talking about the pyrex lenses, not TIR optics). But the polycarbonate lens used in the 6PX and G2X scratches very easily. I scratched one of mine badly when I wasn't thinking and cleaned it with a paper towel. Won't do that again...



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