While shooting my 365 Macro this afternoon, the gun stopped working properly. It was feeding cartridges, the striker felt like it was releasing, but the round wasn't firing. The cartridge had no mark on the primer. The trigger pull weight also felt lighter.
Initially, I thought I might have a broken striker. I then switched slides with my carry gun, and it still wouldn't fire. I switched to the lower from my carry gun, and everything functioned properly.
Back at home, the Wheeler gauge said the trigger pull was now two pounds lighter. After removing the FCU, we can see part 29 is broken, and I believe not depressing the firing pin block. Will call Sig in the morning.
Attachment 116723