Arcade Light Guns ?

I recently picked up a Lethal Enforcers 2 board and I am trying to find a gun to work with it. I know the original gun was the "justifier", but will a happ .45 caliber gun work ? Also I was wondering if there is a way to hack up a console light gun for use with the game ? I ran across two links on various forums but the links were dead. Any help would be appreciated.

1. The Happ .45 should work
2. You'd need an old console light gun; something like a Zapper that simply reported a trigger line and an optic line.

You know what I'd be interested in? Using Happ .45s for the home Lethal Enforcers ports. I wonder what would go into that.

I bet the Sega one would be easy enough but it might be trickier to do the SNES one.