Um reap, those guns don't exist you know this yes? They were made in a future world for reasons that don't exist, they have intergral components like smartlinks. Just go with whats actually in the vampire rules set.
You already have guns, good guns, do you really need more? Your a vamp you have nifty powers, powers that you don't need permits for, powers that aren't obvious just walking down the street. I mean Vampire is not the combat driven game that DnD is, and I doubt that this game is going to see even half the combat of a Sabbat game.