Engineered to merge full-size capacity with a compact slide assembly, the Echelon(TM) 4.0FC pairs a 4-inch barrel with a full-length grip. At its core is Springfield's Central Operating Group(TM), providing a serialized foundation for modular performance. The revolutionary Variable Interface System(TM) enables direct-mount compatibility with a wide range of today's leading optics. Fully ambidextrous and equipped with tritium/luminescent U-Dot(TM) sights, the 4.0FC delivers duty-grade capacity with fast handling in a balanced, do-it-all platform.