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Get some colored circular stickers, like orange ones. They usually sell them at Staples and such and are about the size of a quarter. Get some paper plates and string.
Sticker on the center of the plate, plate tied to the string. Hang the string from the target framework and twist it so that it untwists on its own. Send it down range to an acceptable distance. As its spinning, switch from the ready position to fire every time you see the orange sticker. Try to only shoot when the orange faces you.
Cheap, but highly effective
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