It seems to tick all the boxes. As with most rules there are exceptions. I have a live pigeon gun with automatic safety, 30 inch barrels, 2 3/4" chambers, side clips, third cross bolt fastener, full and extra full chokes , flat file cut rib, half pistol stock and ejectors. Oddly I also have a 16 bore that fits in every way with the above criteria of a pigeon gun. Probably built as a one off in that bore. Lagopus…..