There is no law against making any magazine. There is a law allowing a federal agency to ban any shotgun arbitrarily. That is what we are concerned about.
There is such a thing as picking one's battles. For example, supporting a law like HR 1096 upholding the 2nd Amendment in its original meaning that would then apply to all firearms, including those this forum focuses on, instead of challenging a ruling on a specialty item.
The administration of this forum has chosen its position on this matter, and we who are not administrators need to comply when posting in this forum. The item under discussion is not illegal - it is unwelcome, and its inventor has rudely pushed it on this forum with persistent disrespect to the membership in general.
Any reasonable business owner knows better than to do that. I would be concerned about doing business with a person who acts and talks that way to who he claims to be potential customers. Calling people "wuss" or similar if they don't buy his product would make me feel like a wuss if I ever did buy his product. Plus his generally unprofessional approach makes me weary of trusting him with my money, and weary of investing in a product supported by him.
Coming to a discussion site, breaking a forum rule, and profanely insulting a majority of its membership and leadership is reason enough to ban someone without any explanation. He can go find another website and see if his behavior is tolerated any better there. He can go and make his items and see if they get enough publicity for any of our concerns to come true.
But he should not have acted the way he did under any circumstances, and those actions deserve neither the patience of administrators nor the financial support of forum members.