Can firearms be used during close combat?

Fairly new Keeper here.

During the last session, almost all of the players used their readied small firearms (pistols) during close quarters combat. Together with firing multiple shots when it was their turn, they seemed to have a giant advantage over small weapons, like a knife or club.

So, is there a rule for using a readied firearm during a brawl? I can’t imagine that one would be able to easily gun the opponent down (as long as there are still bullets loaded), rather than being hindered to shoot (e.g., both characters struggle for weapon control).

Can players be forced to use their hand combat skill?