Two-part polymer ammunition casing

A method of manufacturing a casing for an ammunition cartridge, the method comprising the steps of:

• providing an injection mold;
• utilizing the injection mold, injection molding a first polymer forming a first part of the casing, wherein the first part of the casing is generally cylindrically shaped along a longitudinal axis extending from a projectile end opposite a stepped end, the stepped end forming a first end of a mechanical connection;
• removing at least a portion of the injection mold exposing the stepped end of the first end of the first part;
• disposing an additional injection mold about the stepped end of the first end of the first part;
• utilizing the additional injection mold, injection molding a second polymer forming a second part of the casing, wherein the second part includes a second stepped end forming a second end of the mechanical connection;
• wherein the first end and the second end are mechanically locked together preventing a separation of the first part from the second part;
• providing a thermal swagging tool;
• and
• utilizing the thermal swagging tool, forming a conical tapered region along the projectile end of the first part.