recfreak

hey all, nOOB here i just bought this gun for 150. it works for a little bit until u start shooting really fast. then it shuts off and you need to turn it back on. i got mad and busted the chip inside and just hooked up the wires from soleniod to the trigger. It works better now than new (it doesnt turn off during play)
Does anyone have any sugestions for a homemade circuit for an E-grip ?
I've checked various electronics sites and found nothing specific for E-grips.
some features I would like to include are
semi auto
3 shot
ramp
turbo

I'm working on a 555 based circuit It wont have any features but the BPS should be variable.