This instructable was fun I got to work a little while on this, so please don't leave rude comments. For my first pen gun I think it works pretty good.
IMPORTANT: THIS MIGHT NOT HAPPEN, BUT I AM NOT IN ANY WAY RESPONSIBLE FOR INJURYS!
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You will need:
3. strong scissors (strong enough to cut through cheapie plastic)
4. Rubber band
1. your hands
you are now done, now go shoot some people! just kidding be safe shoot rabbits instead.
REMEMBER: HOLD THE TAPE SO THE BAND DOESN'T COME OUT!