The present invention relates to a base assembly (100) for forming a base portion of a plastic container. The base assembly comprises a base pedestal (104), a base mold attached to the base pedestal, a push rod (102) movable between a first position and a second position with respect to the base mold to reposition a portion of the plastic container, and an activation mechanism adapted to move the push rod between the first position and the second position.

An extrusion-blow-molded plastic container has a container body closed with a bottom and a neck with a pour opening. An inside wall of the container neck has at least one calibrated structuring, extending at least in places over a periphery of the inside wall. The calibrated structuring is limited in the direction of the container body by a material accumulation shaped as a collar extending at least partially along the periphery of the inside wall and essentially crosswise to a center axis of the neck.