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scissors
duck tape
rubber band gun
baseball card holder (clear)
sharpie marker ( not pictured)
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More like a targeting system that needs tons of work. Also, you might want to think about the way rubber bands tend to work more like throwing things; the higher you aim, the further the projectile should go (and thus rendering the scope completely useless). If you want a scope that will actually work, look at a grenade launcher scope and give it some thought.
it CAN be duck tape, as well as duct tape. either is correct.