Designed around Springfield's innovative Central Operating Group (COG) system, the Echelon offers modularity with interchangeable grip modules and a billet-machined slide. The melonite-coated slide includes an optics-ready cut compatible with multiple red dot footprints, while the tritium/luminescent front sight and tactical rack U-Dot rear ensure reliable co-witnessing and visibility in all lighting conditions.This pistol comes complete with a total of five magazines-three 17-round and two extended 20-round options-giving you flexibility for duty, range, or EDC setups. A dual-compartment Springfield range bag is also included, making this a comprehensive out-of-the-box solution.Springfield Echelon 4.5F Comp Specifications Manufacturer: Springfield Armory Model: Echelon 4.5F Comp Action: Semi-Automatic, Striker Fired Caliber: 9mm Frame: Full-Size Polymer, Medium Grip Module Barrel: 4.5" Hammer-Forged Steel with Integral Compensator Barrel Twist: 1:10 Finish: Melonite (Black) Slide: Billet Machined, Optics-Ready Sights: Tritium/Luminescent Front, Tactical Rack U-Dot Rear Optic: Crimson Trace CT-1500 Red Dot (Factory Installed) Magazine Capacity: (3) 17-Round + (2) 20-Round Total Magazines Included: 5 Weight: Approx. 23.9 oz Accessories: Springfield Dual Range Bag Special Features: Threaded Barrel Compensator, COG Chassis, Red Dot Optic, Modular Design