I've seen soft parts wear because they were not of proper hardness. A good gunsmith who knows metallurgy will usually be someone trained as a machinist then advanced to being a tool and die maker and then became a gunsmith. They are getting rare as they retire and the skill is lost. They know the proper hardness for a part given it's function. Too hard is not good either because the part becomes brittle. The gunsmiths we have here only can do barrel work and chambering ----lathe work or mill work. You folks on the mainland have more gunsmiths to choose from.So you have seen this before? I like the peening and re-heat treating idea.