Originally Posted by gogojuice
Go to your local hardware store and get a sheet of lexan. They come in various thickness.
Stops bb. Cost is approx $5-10 for a sheet and you can make about 15 shields.
I can tell you that the price for Lexan has gone up. I recently shattered my flashlight lens by dropping it only once while I was running. I went to Home Depot for a sheet 11" x 14" for about $15 to make a replacement lens. Polycarbonate sheets are nice and durable, very easy to cut with a jigsaw and shape with an angle grinder.
A fun DIY project that will leave your arm with small bits of PC shrapnel.