Abstract: Apparatus for injection molding parts which comprises forming mold cavities from a set of molds and injecting molding material into the cavities to mold a part on a pin extending up in each cavity; the molded parts are then ejected by being pushed up and off the pins when the molds are moved to expose the parts; ejection involves the application of a substantially uniform force over the base of the moulded part. The apparatus includes means for automatically degating moulded parts from waste material involving initial movement of one of the molds in the set relative to the others; automatic degating can be employed which can occur internally or externally of the molded parts; the molds employed with these specific ejecting and degating means, or with other ejecting and degating means, comprise an upper and lower portion of a universal mold base which forms an integral part of the molding apparatus and to these portions are detachably secured modular mold sections.