Hi my friend.! Thank you and nice to meet you.!!I'm going to like having you around .
Just as a geewiz , plexiglass is a pretty poor deflector of anything. Lexan is the stuff that was developed for bullet resistant /proof glass . You will find it much more resilient than plexiglass.
DuPont has an 6x6x12 inch block of it with a 50 BMG bullet trapped in it . It was intended to be a lightweight bullet glass but it scratches too easily. Generically it's called polycarbonate and is of optical quality used for prescription safety glasses.