1=Bottle; 2=Heat-shrink tubing; 3=Adhesive tape; 4=Tube; 5=Long tube or casing from a felt-tip pen (the size of Airsoft's ball); 6=Butane lighter; 7=Saw; 8=Rubber or plastic hose; 9=Compressed-air blowgun; 10=Hot-glue gun.
When the glue has set, drill a hole in the end of the large tube and another hole in its side. Cut the smaller tube (to create the gun's barrel) to a length of 2 inches.
Glue the small tube to the hole in the end of the large tube.
Wrap the end of the blowgun with adhesive tape to make the connection airtight. Place the end of the rubber hose into the hole in the side of the tube and wrap that joint with adhesive tape also.
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