I suppose rifle construction is related to rifle power...
Had a bolt handle come off (once). Have broken an extractor but have also replaced one on a Mex 98 (who knows what that rifle was subjected to previously) and honorable mention for those pure crap extractors (cast?) on the earlier M-70 Classics when introduced. I think that was in the 80's or 90's, I don't remember or care but kept the busted ones.
