Well, its not really the shot gun itself. Its actually shells that can be muzzleloaded into a paintball gun. sends 20-30 bbs down range.
I used a $20 gun from wall mart
(it may be necessary to plug the feed neck to prevent gas from escaping)
I am not liable for what you do with this
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Step 1: Supplies
2) 1/2in. PVC
3) 1/2in. Dowel
5) BBs (popcorn kernels work to and are cheaper)
Step 2: Step 1
Cut a 1"x1" piece of paper
put the paper on the end of the dowel and run it through the PVC
flatten the paper tightly to the dowel
LEAVE IT ON
Step 3: Step 2
Wrap the tape tightly around the paper that is on the dowel with the adhesive on the outside
then take it off and fill it with BBs (corn kernels)
Step 4: Step 3
Put a piece of paper (about 1/2"x1")over the top
leave the flaps out, this will keep the shell in the barrel
ram the shell into the barrel.
These have a relatively small payload.
Ive made some bigger ones with sillilar methods to great effect
you may want to try diffrent things.