You could try to make this marshmallow shooter. https://www.instructables.com/id/Marshmallow-gun/ I hope that helps. -BLUEBLOBS2
like this picture, copy this it is composed of pvc and balloon ,rubber band make this so easy
it is the sample of sumpak gun
you have to make a in pvc pipe gun or called sumpak gun
I have an instructable on that! https://www.instructables.com/id/Easy-marshmellow-shooter/. Enjoy!
weld copper or aluminum pipes just make sure you put a food safe adhesive on the mouth piece or you shall get sick