I agree with 'Whig'. U.S. Krags generally come apart easily for me without destruction of parts.

If a pin is stubborn, apply penetrating oil, brush exposed surfaces with a toothbrush, and try driving the pin from the other direction. (Maybe it got reassembled incorrectly at some point of time).

I use steel & brass punches, a plastic or copper mallet, and support the parts on hardwood or a bronze plate.

It should not take excessive force. Getting a pin or screw to start moving is half the job.

p.s. - FredC, you are not "Bubba" and confession grants absolution.