Attachment 58007
This is the spring that Sig no longer installs in recent builds. I feel certain that I now know why.
This little spring, which is the spring that retracts the lever that lifts the striker block, was a little hosed up. My thoughts are that the striker block lever was "stuck" in the upward position, with a striker foot not held by proper dual spring tension, and when our guy holstered, when his pistol clicked down and seated, the striker slipped from the sear and fell forward....discharging the HST round.
I have taken several apart from that same general time of year this one was build. They all have the newer style sear with spring posts instead of the dimples.
I'm 90 percent sure this discharge wasn't his fault. We assumed garment on the trigger but now I'm leaning towards the gun. I plan on sending Sig a certified letter this week as I need a replacement sear for this gun as well as any others I come across that have the similar, older style sear.
We have pulled them from duty and most have qualified on other pistols. We will see where it goes. I'd like confirmation from Sig that the fix is to simply remove that striker block lever spring from each copy and to ensure they have the most updated sear. If that's the fix to make them safe, I can do that for nothing for most of the guns we have.
I also appreciate this thread and they way everyone conducted themselves.