The metallic state of conducting polymers is a subject of continued interest and controversy. By means of a series of high-precision reflectance measurements on PF6-doped polypyrrole (PPy-PF6), the processes occurring as the system passes through the metal-insulator (M-I) transition are clarified. Evidence is presented that metallic PPy-PF6 is a "disordered metal" and that the M-I transition is disorder induced. It is concluded that the electronic properties of PPy-PF6 result from weak localization and an Anderson-like M-I transition.