I don't mind how you organise the site, it's a great and very useful site.
I've looked though, and the section you refer to doesn't seem to be there when I look.
There's a section a called Sales,and it has a firearms section. There doesn't appear to be a section called "Fire arms and related items". If you're threatening to remove adverts that don't comply, I think it would be fair if there was a theoretical possibility of being able to comply. Apologies if I'm reading you wrongly.
Perhaps a reloading section in "Sales" would be a good compromise all round.
Cheers
Derek