Springfield Armory Echelon 9mm 4.0C, FDE (EC9409F-U)Description Engineered for carry and finished in durable Desert FDE Cerakote, the Echelon 4. 0C retains the key features of the full size model, with a shorter 4 inch barrel and compact frame for enhanced concealability. Its revolutionary Variable Interface System provides unmatched direct mount compatibility with today's leading red dot sights, complemented by tritium U Dot irons for fast target acquisition. The serialized Central Operating Group is