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propane machine gun simulator help

I like to make a small propane machine gun simulator, the kind they use in movies.

I need to know how to make the firing circuit board, what type of solenoid's I can use & what type of ignition coil & spark plug to ignite the gas.

Put it simply, I need a DIY on How to build an oxygen propane machine gun simulator.

Picture of propane machine gun simulator help

http://visualcollector.com/OBLI/Vickers.htm

found this like in 3 minutes on google.