Springfield Armory Echelon Compact 9mm Luger 4in Black Melonite Pistol - 18+1 Rounds - Engineered for carry, the Echelon 4.0C retains the Key Features of the Full-Size Model, with a shorter 4in 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. Compact: Shortened at the Frame and Muzzle, the Echelon 4.0C boasts Full-Size Features in a Concealable package. Central Operating Group: The Central Operating Group is self-contained and serialized, providing a robust housing for the patent pending system. 3-Dot Tritium Sights: For enhanced day and night visibility, self-illuminating tritium inserts are housed within the 3-dot sight system on the Echelon.