This is my durable rubberband gun.
U know how to assemble it as u see the photo.
I just want to remind 3 things...
1. The trigger is made by using a screw, u better add  washer to make it more durable.
2. There is a safety design :  try to use shorter PVC pipe to decrease the damage of the rubberband gun
3. If u don't like the rubber band placed under the pipe, u can add another clips which connected with wire.
i have a simlar idea execpt it does does use cable ties but rather mini clamps and duck tapeso i guess variants are common ideas therefor are not patentable
but i honestly thought of my own version before i saw urs
Your idea for the trigger is great, is suitable for the little hand of a kids.! Certainly i build your rubberband gun.

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