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How to Make a cardboard replica prop of any gun Cardboard is not the most sturdy of building materials, but it is cheap, abundant, and somewhat rigid. That's all you need to make this awesome prop. This video will show you how to make cardboard replica or prop of just about any gun, in this case a Glock handgun. It looks surprisingly real and is very cheap to make, so if you need a gun for your film or costume and don't have money or carpentry skills, this gun should fulfill your needs.