Yet.Don't stress too much about it, some of it comes from ongoing jokes.
The classifieds have been subjected to abuse in the past (and even the basis of a ridiculous lawsuit). The rules are there in part so they remain a useful tool for occasional private sales rather than a primary source of income for a business or individual. That is what IP status is for.
If you have multiple related items (for example, different brands of the same caliber like you posted), you could always put them together in one ad and give buyers the option of purchasing all or part.
It could be worse... nobody told you to go and get your shine box.
Yeah, about that.