Engineered to merge full-size capacity with a compact slide assembly, the Echelon 4.0FC pairs a 4" barrel with a full-length grip. At its core is Springfields Central Operating Group, providing a serialized foundation for modular performance. The Variable Interface System enables direct mount compatibility with a wide range of today's leading optics. Fully ambidextrous and equipped with tritium/luminescent U-Dot sights.