A bit of history: Mike Dillon stopped using distributors when I had my FFL in the 1980's, because he didn't like the fact that they sometimes discounted his products and had sales to retailers. They would post them in Shotgun News, which used to be the FFL's bible. He was a curmudgeon, and wanted total control of his products, so he took the big gamble and went to direct sales for many years, and the only place you could buy his products was factory direct. It was only in the later years that he "allowed" select retailers to carry his products, under strict guidelines. That may have been eased after he passed away, but that's speculation on my part.
My neighbor used to own a metal plating business in Phoenix, AZ, and did plating for Dillon. He says he was so hard to do business with, that he finally told him to take his business elsewhere, and refused to even bid on work from him.
Hope this helps.
Fred