That's a valid question. The purpose of this article was to show gun owners that there are gun laws which reduce crime but do not infringe on the rights of law-abiding gun owners. The gun laws mentioned in this article do exactly that. At the same time, I wanted to avoid any mention of gun laws that ban guns because that would completely freak out a large segment of the gun-owning population who believe all gun laws lead to gun confiscation.
I agree that there is merit to banning military-style weapons, but for the purpose of this article, I felt it was important to focus on very effective gun laws which can and do reduce crime but do not in any way infringe on the rights of law-abiding gun owners.