Well, there’s definitely something causing some gas to escape and leave marks on your breach and action face. You’re right, that’s definitely no Bueno. Next thing I would do is check the condition of the tumbler to see if there’s any signs of that gas making it back into the action….if it is, the face of the tumbler will also be scorched.
You said the trigger wiggles and isn’t tight when it switches to its 12 lbs pull phenomenon……has your gunsmith checked to see that the tumbler is at full cock or is the sear resting in the intercepting/safety bent instead of being in the bent at full cock? If that’s the case, somethings gotta be causing the tumbler to come out of full cock and resting in the intercepting bent which would definitely explain the heavy trigger pull.
If the tumbler and sear are dirty, I’d highly polish them both, reinstall without lube and try and see if you can see any abnormal drag/friction marks. It would explain a lot seeing where the parts are resting when the 12 lbs pulls are happening.
Just FYI….JJ Perodeau is a very good mechanic when it comes to issues like this. The escaping gas on the left barrel is fairly concerning.
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