Really only need to give it a 5/"32 flash hole. The important part is adjusting the head space.
You guys should be happy that a company listens to their customers when something isn't working right.
The factory plug now is good for loose powder and pellets. The blackhorn plug wont work with pellets. So selling it as an accessory is the best option to make sure that person knows what its for.
TC doesn't come with over sized hinge pins from the factory or trigger kits to lighten the trigger pull, do they?