A metal bottle assembly adapted for use on a plastic bottling includes a metal bottle with an outsert assembled on the neck portion of the bottle. The outsert may be constructed from plastic material and may be fixed to the bottle using an interference fit. The outsert enables the bottle to be placed on a plastic bottling line with minimal or no modifications to the bottling line. The outsert also ensures that the metal bottle is not damaged by handling on the plastic bottling line. In some embodiments, the outsert is designed to elastically deform as it is pressed on the neck of a pre-formed metal bottle and therefore create the interference fit between the outsert and the bottle. In some embodiments the outsert is retained on the neck of the bottle through the interference fit alone.