The Springfield Armory Echelon 4.5F represents the full-size expression of the Echelon platform-pairing a 4.5" barrel with a full-length grip and factory-mounted Aimpoint COA optic for uncompromising performance. Built around Springfield's robust stainless steel Central Operating Group(TM), the 4.5F delivers true modularity without sacrificing durability. Designed to endure hard use in professional and defensive roles, the Echelon 4.5F blends advanced engineering with intuitive ergonomics. The longer slide and barrel increase sight radius, enhance velocity, and promote smoother recoil impulse, while the full-size grip maximizes control and capacity. Out of the box, it's configured for serious work. The Echelon 4.5F pairs a factory-mounted Aimpoint COA enclosed-emitter optic with Springfield's Variable Interface System(TM) (VIS), allowing low-profile, direct mounting across multiple footprints for enhanced durability and faster dot acquisition. Its serialized stainless steel Central Operating Group(TM) (COG) provides a rigid, modular foundation with interchangeable grip capability, while the full-size 4.5" barrel and full-length grip deliver improved velocity, recoil control, and stability during rapid fire. Specifications: Caliber: 9mm Barrel Length: 4.5" Configuration: Full-Size (4.5F) Optic: Factory-Mounted Aimpoint COA (Enclosed Emitter) Controls: Fully Ambidextrous Frame: Modular Polymer Grip Module Finish: Black Magazines: 1-20rd Magazine and 1-17rd Magazine Action: Striker-Fired