there is a difference between stating the obvious and nitpicking casual details.
to some, it is a magazine, to others it is a clip, if you KNOW what they mean when they say it, than they have conveyed their message to you, and you obviously knew what they meant, why go around policing everyone about vocabulary? is that your job?
If someone knows what end the bullet comes out of, knows how to work the safety/action, knows how to take care of it and store it properly, i don't care which name they call the parts on their gun.
I do know you are right, I also call them magazines, but I won't correct people on it anymore, because it still won't help, and it just makes me, or whoever else does it, irritating to be around.
Have you ever talked to anyone who is convinced that a regular differential is a "limited-slip"? there are a LOT of people out there who are convinced of such things as the " drive-wheel" or that a standard truck has a "limited-slip".
I know they are wrong when they say that, its an open differential, a limited slip is a more expensive option, with clutch plates, but i'm not on a personal crusade to correct all the vocabulary errors of the world.