Steve in NC
Member
Okcafe86,
I'm not totally convinced you have found the true root cause yet. I've saved some of your earlier pictures back on page #1 and compared them to the pictures you posted in post #48 above which were taken before an after you modified the end of your firing pin.
Here are my thoughts... Looking at some of the primer indents in both before and after firing pin mod pictures, there is some strange stuff going on. I would consider these indents ot really be offcenter more than usual. And I see some swelling around the firing pin indent and sometimes an elongation of the indent itself. I wonder if the firing pin is still forward when your firearm is cycling and trying to the eject the spent brass out? Now granted this isn't uncommon with a standard striker fired design across many different manufacturers with a floating(semi-floating) firing pin design. But, I've never had a 320 apart yet to see the true inner workings. I just wonder is SIG is doing something different that is causing more firing pin drag on the primer during the extraction and ejection phase of the firing sequence that you might end up with a small burr again and go this this all over again at point in the future? Meaning... is this "issue" is why you had to shorten and polish the firing pin in the first place and it just might happen again after so many rounds? Would be interesting to actually measure your true firing pin protrusion and know what SIG's specs are for the 320? Maybe by shortening your firing pin you might have helped this enough to where it doesn't drag as much and maybe it won't happen again also.
I'm curious on things like this. If you wouldn't mind keeping loose records of round count and keeping us updated on the status of this pistol going forward.
Anyone else have any thoughts?
Steve
I'm not totally convinced you have found the true root cause yet. I've saved some of your earlier pictures back on page #1 and compared them to the pictures you posted in post #48 above which were taken before an after you modified the end of your firing pin.
Here are my thoughts... Looking at some of the primer indents in both before and after firing pin mod pictures, there is some strange stuff going on. I would consider these indents ot really be offcenter more than usual. And I see some swelling around the firing pin indent and sometimes an elongation of the indent itself. I wonder if the firing pin is still forward when your firearm is cycling and trying to the eject the spent brass out? Now granted this isn't uncommon with a standard striker fired design across many different manufacturers with a floating(semi-floating) firing pin design. But, I've never had a 320 apart yet to see the true inner workings. I just wonder is SIG is doing something different that is causing more firing pin drag on the primer during the extraction and ejection phase of the firing sequence that you might end up with a small burr again and go this this all over again at point in the future? Meaning... is this "issue" is why you had to shorten and polish the firing pin in the first place and it just might happen again after so many rounds? Would be interesting to actually measure your true firing pin protrusion and know what SIG's specs are for the 320? Maybe by shortening your firing pin you might have helped this enough to where it doesn't drag as much and maybe it won't happen again also.
I'm curious on things like this. If you wouldn't mind keeping loose records of round count and keeping us updated on the status of this pistol going forward.
Anyone else have any thoughts?
Steve
