paintball board/photagate help

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Rambo

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So I'm designing a circuit to fire my paintball gun. I already have what I think will work to fire the gun semi-automatic whenever a ball is present. I have an AND gate system to make sure there is a ball loaded in the breech (using photogates). Ill show you my schematics of what I have done right now. My ultimate goal, however, is to set up a circuit so that as long as the trigger is being held down, the gun will fire a ball every time a new ball enters the breech. So it will be kind of like full automatic except it will be firing at different paces depending on how fast the hopper is feeding balls in to the breech. I've tried quite a few ideas, but they all fall through eventually so i was wondering if you guys had any ideas or solutions. Also, if you see anything wrong with my current schematic, let me know.
 

schematic
 

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