The U.S. Marine Corps is seeking information on non-developmental sub-caliber gunnery training devices for the Amphibious Combat Vehicle (ACV-30) equipped with the Mk44 30mm cannon, to reduce ammunition costs and enable training on ranges unsuitable for full-caliber rounds. The government may use responses to justify a sole or limited source award, and is considering a prototyping Other Transaction Authority (OTA) agreement or sole source contract. Vendors must demonstrate the ability to deliver the first training system prototype by 29 January 2027, with production fielding anticipated in March 2027. Performance of services is not explicitly tied to a single location, but the government will provide access to an ACV-30 for analysis if a contract is awarded. No budget amount is specified in this RFI.