The Springfield Echelon 4.0C COA delivers a compact, optic-ready striker-fired platform built around Springfield's innovative Central Operating Group (COG), offering modularity, durability, and modern performance. Equipped from the factory with an Aimpoint COA optic and the VIS Optic Mounting System, this pistol is optimized for rapid target acquisition and adaptability, while its 4" barrel and reduced weight make it an excellent balance of concealability and shootability. Specifications and Features: Brand: Springfield Armory Model/Series: Echelon 4.0C w/ Aimpoint COA Caliber: 9mm Capacity: 15 | 18 Action Type: Striker Fired Barrel Length: 4" Overall Length: 7.25" Twist Rate: 1:10" Weight: 24 oz Frame Material: Polymer Finish: Black Melonite Sights: Luminous Front Sight w/ Tactical Rack U-Dot Rear Optic: Aimpoint COA