Engineered for carry the threaded Echelon 4.0C retains the key features of the full-size model with a shorter 4.7-inch threaded 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.