Yes your right I ment lexan...Plexiglass is almost worthless - I think you are talking about Lexan - the "bullet-proof" plastic. It has to be a half inch thich to stop small arms pistols and an inch thick to stop some magnum pistol rounds. At three inches thick it will stop some low velocity rifle rounds and all the magnum pistols. At six inches thick it will stop most non-magnum rifles with expanding type bullets and shotgun slugs. If you think you are going to stop a metal piercing round from a 3006 or a solid or FMJ bullet from any magnum guess again. If you armor your BOV you can add about 50 pounds per square foot of armor just to defeat small arms pistol to medium powered magnum pistols. Unless you have access to ceramic or reactive armor technology forget the term "bullet proof".
Machinist friend had some 1" lexan left over after a job and decided to see how good it really was. 9mm and .45 ACP bounced off and caused a slight depression with raised ring around the impact point. He thought that was pretty good and tried his Mine-14 next with standard FMJ. Set lexan up against a water filled pail (just incase) and fired from 30 feet behind some machine for cover. OMG!, penetrated lexan, thru the pail of water, ricocheted off something and disappeared. When it rain a few days later, he found a hole in the roof.Yes your right I ment lexan...
But a inch or 2 of lexan might just help.
Tell me how to better armer the door without adding say no more 25lbs and under $40.00 pr sq ft. Stay with in reality lol
Do you have any idea of how many layers and what kind of backing material it will take to stop a bullet from a handgun?, a rifle? a slug from a shotgun?