There are so so many different drover bits, styles and screwdrivers I have two dedicated drawers in my tool box just for them. In the case of "specialty drivers", I usually buy the bits themselves rather than the entire screwdriver so they are easier to store and keep organized.
Even with all the bits I have, I do find myself having to actually make or regrind a bit for a specific purpose once in a while because just when I think I've got them all, they come up with a new one that I am missing!
I have made at least a half dozen bits for guns. There are actually some screws on firearms that are not standard in even the large Master kit from Brownell's! Once in a while even if the kit does contain what hey say is the right bit, it doesn't fit quite right and the last thing I want to do is bung up a screw on a beautiful expensive firearm. Gunmakers have varied their screw slots over the years - even S&W has.
