From the photos, that's an interesting place for a burst to occur. Right next to the midrib. If you're measuring barrel wall thickness, that's where it's hardest to do. You wouldn't think there would be a thin spot to worry about on a new Beretta OU, but I do know of one modern Spanish sxs from a very good maker that blew due to a thin spot. My money would still be on an obstruction burst of some sort, but it would be interesting to measure wall thickness where it blew.