Early model S&W M&P pistols used small diameter solid pins to retain the extractor; like most mfg. a hydraulic arbor press with a few thousand psi runs thepin in perfectly within a matter of seconds, removing it was another matter. S&W eventually switched to a roll pin which is much easier to exchange; for the same reason SigSauer did similar pin conversions for their firing pin position retaining pin.
For tight solid pins in particular, after applying some Kano Kroil for a few minutes, use the tapered starter punch (Wiha / Lyman / Proto make good ones) just to make the pin move a few millimeters, then switch to short shaft parallel punch then the longer parallel punch as needed; this sequence will save the thin punches from destruction. The silver lining is that you can take your bent pin, shorten it now and you will have the first member of your short punch set.
The Rennsteig parallel punch set is clever in that an outer sleeve that supports the punch pin slides along its length, so you can begin with a "short" shaft punch exposed / supported so as you advance the length of the pin into the pin hole being removed, the pin hole walls themselves now continue to support the shaft of the punch.
I made a set of brass roll pin punch holders.