bag06a:
...the only hints he gave were that he completely rewrote the software...
I figured as much. I've started writing my own software for this as well. Right now it's a series of blinking LED's in the simulator 
Also, I was able to confirm that VCC was 5v. (finally found my multimeter :D)
I figure that since I have the pinouts and a pretty good idea how the platform is supposed to operate (pull trigger => fire gun), I have a good chance in writing something that works. If you'd like to collaborate on this adventure please send me a private message and I'll give you my email address.
I think we've exhausted the Arduino nature of this topic, so this forum is probably not the best place to proceed.