The Springfield Armory Echelon 4.0FC Handgun is engineered to merge a full-size frame footprint with a highly maneuverable compact slide assembly. Built around the self-contained, serialized Central Operating Group (COG) stainless steel chassis, this innovative platform enables users to swap the inner core seamlessly between different modular grip sizes. Its hammer-forged 4-inch steel barrel and recontoured slide are finished with a robust Melonite treatment to provide superior duty-grade protection against field corrosion. The revolutionary Variable Interface System (VIS) allows shooters to direct-mount over 30 popular red dot optics footprints low to the slide without relying on clumsy adapter plates. Specially configured for restricted capacity regions, this "do-it-all" package ships with high-visibility tritium U-Dot sights and two 15-round flush steel magazines.