Backing up to the 2 June set of pictures (different barrel?). If the numerous small dimples are bulges, did all of them occur, along with the two larger bulges, from one single obstructed shot? Some of these examples seem to have the look like there was some repetitive excessive force on the barrels.
I'm just thinking that there may be signs to look for that a gun might not have been treated so well. If every failure is an obstruction, it seems to be the logical thing to be aware of. There just could be more to different situations.
