I am a noob who made a gun. I wanted a gun I could fill at a hydrant and not rely on carrying a tank. I also wanted optional nozzle sizes so I could try different ones. My design borrows from guns already made before. I decided on a bicycle pump to pressurize the water. I added a funnel to the fill end made of PVC. I have 2 water tanks on the top of the gun that are threaded in so I could change the size of the tanks as I experiment. I fill the gun by turning it upside down, opening both the fill ball valve and the discharge valve, and letting water run into the funnel past the water tanks. As the water drops into the tanks the air displaced easily comes out. I know the gun is full when the output stream becomes steady. I am getting about a 40' shot when I pressurize up to 100psi. The bike pump has a built in pressure gauge which is nice.
I need to improve the pump mount to the gun body as my tie wraps and plastic bracket did not hold up well in my first battle.
Anyways, I hope you all like it.
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