Cool and easy pen gun all u need is a orange knex,bic pen,tape,and two rubberbands
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Step 1: Get the Materials
get your bic pen,2 rubberbands, orange knex peice,and your tape
Step 2: Taking Apart the Pen
all you keep is the red outer tube part
Step 3: Tape the Bands
Tape on the rubber bands (YOU CAN USE MORE THAN 2 I RAN OUT THE MORE THE BETTER)
Step 4: Stick the Knex In
simpley put the knex in then tape the bands to it
Step 5: Fire!!!!!
put any thing that can fit in the barrel in and pull the knex back and let go (keep holding on to the red tube) HAVE FUN!!!