Peter,

I think you nailed it with your “blow-back mode” comment.

Back in post 93 djandj said there was almost zero CHS and the gun would fire with the breach block NOT completely locked.

If the breach block is not locked, it’s logical that the gun would be operating blow-back mode and that is the cause of the “premature extraction.”

The mechanical safety doesn’t prevent this from happening with this semi-auto striker system design.