What's in the Box Springfield Echelon 4.5F COA 9mm Semi-Auto Pistol (1) 17-Round Magazine (1) 20-Round Magazine Aimpoint COA Red-Dot Sight Cable Lock Owner's Manual Engineered with superior ergonomics and built to withstand the harshest conditions, the Echelon 4.5F sets a new standard for modern, striker-fired duty pistols. With a host of patent pending features, this modular pistol is designed around a robust stainless steel chassis housed in a full-size frame, offering a 17-round flush capacity and 20 rounds with the extended magazine. Factory equipped with the Aimpoint A-CUT paired with the COA closed-emitter red dot sight, this integrated system mounts the optic directly to the slide without intermediary plates, reducing tolerance stacking while delivering a lower, more secure interface for enhanced durability and consistent zero retention. Firearm Features Aimpoint COA Red Dot This Echelon is factory equipped with the Aimpoint A-CUT, providing a direct mounting interface for the included COA red dot sight. Central Operating Group The Central Operating Group is self-contained and serialized, providing a robust housing for the patent pending operating system. (2) Magazines The Echelon 4.5F ships with a flush 17-round magazine and an extended 20-round magazine.. Firearm Specifications Manufacturer: Springfield Model: Echelon 4.5F COA Caliber: 9mm Barrel Length: 4.5" Twist Rate: 1:10" Finish: Black Magazine Capacity: 17 Rounds, 20 Rounds