i dont have a problem with either term. i understand the differance between the two. i look at it more like slang. if anyone on this site was asked to pass a clip "incorrectly" we would all understand what that person wanted so whats the big deal? other than having the chance to correct someone i don't see the problem. lots of things have more than one name. people call ammunition "ammo" or "rounds" should we be correcting that?
in my line of work body piercing have different names depending on what part of the country you hail from. we don't correct people we just make sure we understand what they want and help them.
i just think the term is used "wrong" enough that the understanding still is there. call the muzzle a buttstock i might correct you, but ask for a clip and i'll hand you a "mag" no questions asked.
it doesn't bother me one bit.