If you don't have the money to go out and buy a hopper for your paintball gun, check this video out for instructions on how to craft one using a tiny pvc pipe.
In order to play paintball, a hopper is required so as to load the paintballs into the gun. This is a cheap way to make a small hopper, or "clip." This is probably better served on a pump gun, as those generally require less ammunition than an automatic gun.
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