Springfield Armory Echelon 4.0C Compact Optic Ready Gear Pac 9mm Luger 4in Black Melonite Pistol- 10+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 and provides a 10-round capacity, meeting the requirements for states with capacity restrictions. Features: 1:10in Twist ; Low Capacity, State Compliant, 10-Round Magazines ; White-Dot Front / Tactical Rack U-Dot Rear; The Central Operating Group is self-contained and serialized, providing a robust housing for the patent pending system; Billet Machined, Optics Ready Slide; Black Polymer Frame with Adaptive Grip Texture; Captive Recoil System; Gear Pac includes : Viridian RFX11 Green Dot Optic; Four magazines; Pistol bag;