I am not sure i ever once saw a commercial that had a firearm in it in the USA.. Unless maybe your talking about a commercial for a TV show or movie? In that case sure.
But dont your tv shows and movies also include firearms occasionally and if so wouldnt your commercials for them do the same?
As I said I pretty much grew up entierly removed from guns with almost no exposure to it. I didnt buy a gun until late into my thirties and even then my mom was very much against it.