"Do the small part like plungers actually take such a beatin' during range use Charlie? I wouldn't think..."
To answer this question for Charlie, most don't and should last forever. The exception is the extractor plunger. They take a beating with every round loaded. They do twist and deform, then fly out, causing the bolt to dis-assemble losing the extractor. They are easily lost, taking the bolt apart for cleaning. It is also easy to assemble the bolt with the extractor plunger not turned correctly. And it is hard to see if they are turned right. I think this is the main reason for them deforming causing the bolt to come apart.