Youtuber “The Q” shows how to use plastic soda bottles, tire valves, tubing, and a few other bits to build a homebrew compressed air weapon which can fire a seemingly endless stream of pellets.
image/text credit: The Q
In this video I show how to build full auto airsoft machine gun powered with coca cola bottle tank array.Firstly, you have to build bottle tank array as shown in the video. You need 9 x 2L bottles, tire valves, pipes and metal clamps.
Secondly, you need 0.5 L bottle and air blow gun. As result current gun can do more than 600 shoots per minute and it fully portable.
The machine gun works because as the bottle is pressurized the only way for the air to escape is through the barrel. That escaping air sucks pellets up and out with it like a high velocity vacuum.