Springfield Armory Echelon 4.0C Compact Optic Ready Gear Pac 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 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. 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. Features: 1:10in Twist ; Sights: White-Dot Front and Tactical Rack U-Dot Rear; Slide: Billet Machined, Melonite Finish, Optics Ready; Barrel: Cold Hammer Forged Steel; Captive Recoil System; Black Polymer Frame with Small Grip Module; Gear Pac Includes: 3 Magazines: (1) 15 Round, (3) 18 Round; Viridian RFX-11 Green Dot Optic; Pistol bag;