"Stripper clip" is an unfortunate bit of Yankee ingenuity resulting from a long US tradition of calling everything "clip" rather than making a functional distinction between clips that are loaded into the magazine (necessary for operation) and chargers used only to facilitate rapid loading. To alleviate confusion, these linguistically-deprived folks have added "stripper" to create a two-word compound - which somehow makes more sense to them than simply using "charger". Baffling!