Scanning electron microscopy (SEM) and wide-angle x-ray diffraction (WAXD) are employed to investigate the morphology and crystallinity of isotactic polypropylene (IPP) by conventional injection molding (CIM) and oscillating packing IM (OPIM). SEM. micrographs following permanganic etching show an interlocking shish-kebab morphology within the outer shear region and a much smaller spherulitic core region of the pronounced biaxially self-reinforced iPP specimen by OPIM. The OPIM moldings exhibit three crystalline forms: alpha, beta, and gamma phases. The X-ray diffraction indicates the highest alpha-phase orientation and largest proportion of beta-phase content in the outer shear region of the OPIM moldings.