I may be admitting my ignorance here, but my question is; as the old adage goes " if it ain't broke don't fix it ". Ruger has not changed the basic firing system if their .22 pistol since 1949( with the exception of the MKIII magazine safety) and it has obviously been a phenomenal success. So why would Ruger decide to "play" with success, and screw it up while they were at it re; the MKIV. Is the traditional trigger-disconnector-sear-hammer-safety arrangement (safety in particular) required to be changed because of the MKIV tale-down design ??

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John