Raise your hand if you own a shotgun with a bore diameter of .50 inch or greater... .... ...
Now go back and read Barts last post. In particular, read what he copied from 18 USC 921.
I do read other gun forums. In all of them, those that understand 18 USC 921, understand that all the regulating authority of the BATFE come from the Attorney General delegating that authority to them.
If the BATFE chooses not to recognize IDPA, IPSC, GSSF and Three-Gun as sports, what sports are left?
If the BATFE chooses to initiate the list of Evil Modifications to Shotguns, then anything other than a plain Jane shotty, is a destructive device.