The United States (U.S.) Army Contracting Command – Rock Island (ACC-RI) on behalf of the Project Manager Maneuver Ammunition Support (PM-MAS), will be hosting a Medium Caliber Family Buy 4 (MCFB4) Industry Day. The Industry Day is scheduled to start at 09:00 AM Eastern Time (ET) on May 28, 2025, at the Hilton Garden Inn in Rockaway, New Jersey, with onsite registration beginning at 08:00 AM ET. The purpose of this Industry Day is to provide information regarding opportunities to fulfill upcoming requirements to procure 20 millimeter (mm), 25mm, 30mm x 113mm, 30mm x 173mm, and 50mm Caliber ammunition.