Well, no one has made a peep about this since 2004, presumably because of cost and resolution restrictions (640x480 is the lowest it goes apparently):
http://www.r0r3.com/productsusbopticalgun.htmI'm going to call them this morning and see if that price is still accurate or if the page is outdated...it is nearly 3 years old after all!

That said, given all of my work with the GunCon2 recently, I thought I might try my luck on the Happ Guns. Here's the pdf Happ has on it:
http://www.happcontrols.com/images/pdf/opticalgun.pdfIt's a 4 conductor harness - +5v, Trigger Switch, Optic Signal, and Ground.
Now, I might be crazy, but doesn't that sound DEAD SIMPLE to interface with? Wire it up to a serial port (USB if you want to get fancy about it), At very least the Trigger switch is a simple on/off on that pin. The optic signal is the hardest, but somehow I'm not sure that's really so hard. I wouldn't know for sure until I tried, but open socket and listen for what the gun sends, and decode it, similar to what I did for the GunCon2 (granted, others did it well before me, but didn't blog out every step...)
By chance does anyone have one of these guns handy and feel like experimenting a bit? I might see if I can pick one up cheap from a local vendor, hopefully used. I don't want to buy one full price just to tinker with.