I think most folks would agree, hinge pins are made of hardened steel, and yet the lumps, at least on chopper lump (Winchester Model 21 may be an exception because their barrels were of their harder Win proof steel) are not. Why do they not harden the lumps.....it would seem the mating of 2 equally hard substances would be best in terms of wear. I think this dichotomy in terms of hardness is at least one reason most guns will eventually shoot 'off face' if used enough and certainly if not lubricated properly. Does this make any sense?
