Protective Armor Systems (PAS) bullet-resistant glass

Western Massachusetts company. Four-layer glass-polycarbonate-glass laminate stops .38 and .45 rounds; thicker versions (4.5") in presidential limousine stop RPGs.

This is a piece of armor glass made by PAS, Protective Armor Systems, in western Massachusetts. You'll see it's got four layers — two thick layers of glass, a thin layer of polycarbonate plastic, and then another thin layer of glass. If you shoot a .38 or .45 at that, it'll stop the bullet. If you have four and a half inches of that, maybe a couple of other layers, then you have the window glass that's on the President's limousine, and it will stop a rocket-propelled grenade.