The Springfield Armory Echelon 4.5F 9mm is a striker fired semi-auto pistol featuring a 4.5 inch barrel and 20+1 capacity, factory-equipped with the Aimpoint COA optic for enhanced target acquisition. Built on a full size polymer frame, it combines increased sight radius and velocity potential with modern red dot capability. This optics ready 9mm duty pistol with included Aimpoint COA delivers performance, capacity, and advanced mounting technology in a refined platform. The Echelon 4.5F 9mm full size pistol incorporates Springfield Armory's serialized Central Operating Group within a durable polymer frame for modular strength and long-term reliability. Its 4.5 inch barrel with a 1-in-10 twist rate supports consistent accuracy, while the black Melonite finish enhances corrosion resistance and surface durability. The striker fired action and integrated trigger safety provide dependable operation for duty or defensive use. Factory-mounted with the Aimpoint COA optic, this model stands out as a full size optics ready 9mm pistol engineered for rapid sight acquisition and improved tracking during recoil. The Variable Interface System allows direct-mount compatibility with leading red dot footprints, complemented by a luminescent front sight and Tactical Rack U-Dot rear sight for reliable backup alignment. Included 17 round and 20 round magazines provide flexible capacity for range or professional applications.