"Hey, is that a magazine in your pocket, or are you just happy to see me"...Well, most people around here usually refer to the item in question as a magazine, not a clip. Just food for thought in future posts.
As far as if keeping one in your pocket could lead it to be dirty enough to cause your gun to malfunction? Do you keep a lot of sand, nuts, bolts, twigs and berries in your pants pockets? Do you ever find yourself wading through swamps in water and sewage up to your chest? Are you a coal miner by trade?
Well, according to the NRA/ILA both of these terms share an identical meaning and have, historically, been used that way by: gun manufacturers, the American military, and gun owners.That may be true enough for "everday usage", but it's wrong. ....