Interesting…,
Maybe a bad run of receivers out of spec that wasn’t caught till the barrel was pressed and pinned? If the barrels were inexpensive enough to them I could see where they’d torch the receiver and sell the scrap for what the barrel cost just to keep from having to pull them and deal with the pin channel.
Just speculating. As low as the PSA prices were I don’t imagine they had much leeway for extra labor costs.