There is an EXTREMELY minor change that I am changing to the core rulebook(And by extension, rules and ammo) and that refers to the cost of changing the finish on a gun. It's entirely too high.
I'm also changing the restriction of the colors and adding "Rainbow" as a possible finish.
IT's minor, but I'm updating the books. I'm not changing the rulebook's number, however, because it's just not a big enough change to warrant it.
So Go download the new versions of the same book, today :D