It doesn't really matter if they run commercials or not for guns - LOOK, they removed commercials promoting cigaretes and alcohol but people still smoke and drink, but will they continue to run movies and TV show where there is a lot of violence. Like the NRA states - the president is a hyporite to have protection for his children in school but doesn't want others to have that protection - so is the cable company for not having commercials for guns but yet show movies of violence.
I'm not really big on guns but if you're going to ban ads showing weapons the ban it all (including all Movies & TV shows)