Engineered for carry the Echelon 4.0FC 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 three-Dot irons for fast target acquisition. The serialized Central Operating Group is housed in a compact frame offering a 15-round capacity with the flush magazine and 18 rounds with the extended magazine.