Turk,
I had both my wind wings and visors made by a local glass shop out of lexan and a bullet won't scratch it. I just took the old plexiglass ones down and they cut the new ones out of some left over stock and drilled the holes and charged me $37 dollars for all four. Of course that was back in 1997, so add a few dollars to that. I have had small rocks hit mine and you can't even find where they hit but you can certainly see the chips in the windshield.
Ron