This is a Broad Agency Announcement (BAA) for Metal Castings, which is a five-year research and development opportunity with a Period of Performance from July 1, 2021, through June 30, 2026. The official solicitation details, including all technical requirements and terms, are contained within the attached BAA PDF document. The notice includes several updates that have amended the BAA's language, including the Contract Type and Introduction sections, as well as Attachment C. A later amendment added applicable Cost Accounting Standards clauses. Prospective bidders must use the most current BAA attachment provided with this synopsis to prepare their responses.