There was a supplement book called "Six-Shooter and Space Ships" that had additional weapons. I do not allow all the weapons from the book (Gauss is out of the question), but here are that stats and Descriptions from the book..
Pistol, Light: A ladies weapon or a good holdout gun, light pistols range in size and configuration from derringers to those fancy rigs some folks use for trick shooting. (d4w, Rng: 50, Rate 3, Mag 6 16 credits)
Pistol, Heavy: This meaty, powerful pistol has a bit of heft and considerable physical presence.Two popular brands are the Century Marauder VI and the Deutrex SI–4.The best thing about a heavy pistol is that once you run out of ammo, you can always hit someone with it (for d2 Stun). If it jams and you can’t fix it,you’ve got yourself one fine and impressive nutcracker. (d8w. Rng 120, Rate 2 Mag12 credits 25)
I have to go through some of my notes this weekend and I will post the rules on armour soon.
Just to make sure we are on the same page, I am not producing modules with a lot of gun play. In fact, the first adventure I have for you, it is possible to get to the end without ever drawing a weapon. The second adventure, the theme is to prevent guns from being drawn. So if you are looking for fight after fight after fight - you might be in the wrong game.