The pre-64 action is about as rock solid as you will find. It's not surprising we're seeing a lot of "no problems" reported in response to this topic.
The main "weakness" of the pre-64 action (if you could label it this way), is wear at the engagement point between the safety cam and the firing pin. The pin can wear at this location, making the safety stiff, or in extreme cases, permit the pin to creep forward. This is not a design flaw, but results from poor maintenance (lubricating) of the pin and bolt sleeve.
The trigger and sear can also wear if not kept clean and oiled, which results in a terrible "two-stage" trigger pull.
Bottom line - properly maintain your pre-64 action and it will last several lifetimes of regular use. Neglect it and you'll be visiting my website for replacement parts
