T O, I would disagree in your reference to gunsmith on a screwdriver. Screws used on guns are typically deep and square vs home and hobby which tend to be tapered. A gunsmith type screwdriver is referred to as hollow ground which means the blade is of consistent width for an 1/8" before tapering to the shaft size. A taper ground regular screwdriver is just that, tapered from the tip to the shaft. Hollow ground gunsmith type screwdrivers, be they labled that or not, are the correct screwdriver to use on gun screws so as to avoid what is often seen, buggered up screws.
Just saying.....