I learned quite early in my building, that tempered, or stainless steel, pins can be a giant headache if they become bent. So, I use mild steel finish nails tapered by running in a Dremel on a diamond sharpening stone.
I had a friend inadvertently shoot a trade gun I helped him build, with a shot charge, that had moved forward. If the pins had been 1/16th did., or tempered steel, we would never have gotten the gun apart to repair it. The pins looked like little handlebars. The lock bolts were bent as well. I believe that if the gun had not had the old school upward tang screw it would probably have killed the owner.
Hungry Horse