ronlaughlin
At the risk of going sideways again with MD, I think you have really worked yourself into a great project with fix #3. I believe it to be a lot more permanent and reliable.
Fix #2 would certainly be the next best option for the Accura/Apex senario.
It just seems to me that both of these options are more reliable than trusting an '0' ring over time. With both of your options metal on metal, all metal parts are supported by metal. You also reinforced my thought about metal movement on threads when you said that you 'tighted' the insert tight and machined it to fit.
Ron, another question your #2 fix brings to mind. Does the shim ring you build go between the base of the bushing and the frame or under the 'o' ring area? In my recent discussion with MD he feels the 'o' ring is used as the headspace device and indicates that the bottom of the firing pin bushing does not seat on the frame.
Makes me wish i had CVA just to look for myself. I am not sure my local sproting goods store would appreciate me taking apart one of their display guns to check a thought....
