My friend showed me this istructable but he dosent have an account so ill put it on mine oh by the way this is soooo easy
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Step 1: Get the Stuff
you will need a toilet roll or a clingfilm roll or any sort of card board roll i used a kitchen roll roll.some scissors and some rubber bands i used four
Step 2: Cutting
cut small 2 small slits in one side
Step 3: The Rubber Bands Dun Dun Dun
put a rubber band down both slits
Step 4: The Wrapping of the Rubber Bands Dun Dun Duuuuun
wrap the rubber bands round the one in the slits
Step 5: Ur Done
take the rubber band out of the slits and then when u want 2 use it pull back the band put a rock in and fire up the barrel