For an art-project I'm currently working on I want to design a Gun. As I was trying to figure out how to so this, I stumbeled upon this model. A simplye tube with an L shape. I folded it from one A4 sheet. This is my first attempt, so please forgive me the imperfections of this fold. What I like about this model is the fact that it isn't flat and the way I made it hold itself together. Also it should be easy to make S and U shaped tubes with the same aproach.