Yes they are prohibited.
The BBS is an airgunforum with a sales and wanted section added for contributing members to use --- it is not a sales site.
When someone's first post is an attempted wanted or sales advert it is normally deleted due to this rule. :-
"If you've just come here to buy and sell stuff without contributing anything to the forum, you may well be gagged and offending posts removed."
All the best Mick