I did my 23 with a regular/medium? tip, whatever came with the iron I bought.
One word of advice: if you plan to refinish (I used DuraCoat), you may want to lightly sand the surface. Stippling can leave a very aggressive grip with some sharp little lips.
If you leave it black, you can always sand it down later, but if you plan to refinish, decide on what feels comfortable first.
Still my favorite gun. Been my edc for 3 years (the wear shows):