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easy and works well for how long it takes(check new step (# 6) )
you will need: 2 liter bottle bike pump (with needle) cork two 7/8" PVC valves one 7/8" PVC "T" one piece of 7/8" PVC 1/2" long two pieces ...
using pvc cement, put the pieces together as shown in step 1 picture. IMPORTANT: make sure to glue all pieces EXEPT the barrel! do NOT glue the barrel ...
drill a 5 mm hole down 3/4 into the cork after that, stick the pump needle into the other end all the way
take the barrel out of the valve and put your bullet in the end (i used a marble wrapped in masking tape) make sure its a tight fit ...
to launch, make sure that the valve on the handle is open and the valve leading to the barrel is closed. then stick the cork into the bottom ...
once you get the basic design down, expand on the idea! this is what i did with mine now its alot easier to pump
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