Not trying to feed the flames, but when I asked my questions it was because of other ads and their wording. There is no "set in stone" way of advertising a product.
I've seen ads before for NFA item that were OTD which also meant the tax stamps were covered as well. Others I've seen say things like "NFA tax stamps and transfer fees not included." In everyday stores I've seen a product I like and take it to the counter and before I reach for the wallet, I ask how much OTD. If they punch on the calculator too much, I walk.
Not criticizing or telling anyone how to post their ads, I was just trying to be clear on what is or is not included in a sale.