A magazine loader/unloader includes a loader/unloader housing, including right and left sides, a front and rear connector members, and a bridge member; a loading structure, including a loading plunger, and a loading pusher; and an unloading structure, including top and bottom guides, and an unloading protrusion. Also disclosed is a method of using the magazine loader/unloader, including inserting round, loading round, and unloading round.