Picture of ink tube knex gun
a small gun made of knex that fires pen tubes and has great range and accuracy.
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Step 1: Parts

Picture of parts
parts needed:

2 yellow sticks
10 blue washers
a rubber band
2 orange double sided clips

Step 2: Construction

Picture of construction
take the 2 yellow sicks and on each on put 5 blue washers. Put the 2 orange pieces in front of and in back of the washers like in the picture. Push the washers and clips as far down as possible. Wrap the rubber band around it like it in the picture.

Step 3: Firing

Picture of firing
put the pen tube thru the center hole like in the picture. put the rubber band on the back and pull. get the plastic part of the tube thru the first one and push shoulg get locked in position. push down to fire.

Step 4: Get ink tubes (If needed)

Picture of get ink tubes (If needed)
on the pentube it reads this:

your no.1 source for pens
international jumbo sized refill
get free refills1 email:\ tel: 201-227-1170