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Interested to know why, what you want to stop. Bullet proof windows made by laminating layers of glass together. The bigger to calibre you want to stop the thicker the window ends up being. Bullet proof glass is over an inch thick, very heavy, doors need to be reinforced to stay square, hinges, etc. There are options but if they want to shoot you the door won't stop a bullet at close range without some steel plate or Kevlar etc
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