I don't recall the 2300AD recoil rule, but it has been awhile since I looked at it. Since 2320AD is based on T20, it would use T20 system for handling recoil. I'm nowhere near a book at the moment, so I couldn't honestly tell you.
Come to think of it, I may need to edit the weapon descriptions, as T20 does have a recoil entry, and I'm not sure I used it...
I'll have a real answer later.