[TomTom]

Like most true mods FritzBot ET is a closed mod of the game logic that runs principally on the server. That means that only one such mod may be run on the server at a time. And you cannot add a new weapon without changing the code on the server.

Now the graphics are client side so it could be possible to replace player skins, weapon models, sounds and such of one of the existing guns with something resembling a shotgun, BUT some of the logic would still be on the server only (say weapon spread, accuracy, damage, splash, damage type, recharge etc.). And of course without the server being mod-ed it would have to be impure and therefore would not force the clients to all run the shotgun graphic versions.

So rather than continue this discussion may I suggest you investigate alternate weapons options in one of the other 2 ET bots?