I'd like to get this issue perfectly clear: this won't affect any gun that you can equip with your current loadout.
It only affects if (for example) you had duellist loaded, equipped some dual pistols, then unloaded duellist and loaded up MA.
Now you have a weapon equipped without the required ability, so you'll get a big penalty.
It only affects if (for example) you had duellist loaded, equipped some dual pistols, then unloaded duellist and loaded up MA.
Now you have a weapon equipped without the required ability, so you'll get a big penalty.