I selected 3 but I am probably closer to a 3½.
I do bluing & phosphating, replace/cutdown/rechamber/recrown barrels, replace sights, built-up many different "kits" (e.g., FAL, AK, AR), (re)drill gas ports, create steel replacement parts, craft specialized tools to make working on certain firearms simpler, etc.
For a few years I have been resisting the urge to buy one of the Mill/Lathe combo machines so that i could increase my ability to craft replacement parts. I have one barrel on my bench that I would like to turndown and further mod, but ...
I cannot talk myself into the required expendture of time/effort/money ... so far.
But even considering all of that, I do not think that I am anywhere close to being a gunsmith because all of the above I do to a
very small cross-section of available firearms ... and I only do such work when the spirit moves me, y'know?