butlersrangers wrote on Jan 14^th, 2020 at 6:24pm:

Well, that 'Firing Pin Rod' has been messed with and the Cocking-Piece Knob appears re-shaped!

Sorry for the confusion, the firing pin rod in the 2 last photos are from a junk purchased firing pin NOT in my sporter. They are only illustrative of what could potentially cause AD for others. The cam surface was clearly worn and I would never use it for that reason. The mods to the knob were just to see how much a person could safely take off and how much would be gained for increasing lock speed. Different photos of the same modification were on this site in a different thread several years ago.    (You need to Login

For my sporter, now disassembled I did find the wrong spring that was added many years before I began the sporterizing project. Failures are hardly ever from one cause so I am looking at 2 other potential contributors now. I am going to need some better optics to see look further into this. The light on my bore scope failed and will try to adapt another light to it. I will be looking inside the stock for rubbing and at the bottom of the groove cut into the trigger. also my trigger pin was a light press fit. It was still centered when removed, but could be moved with light pressure. Probably not a contributor but should be improved on the fit anyway.