The Springfield Armory Echelon 4.5F Semi-Auto Pistol with Aimpoint COA Optic redefines what a striker-fired duty handgun can be, offering robust capacity, easy optics attachment, and superior modularity. It's built around the Central Operating Group an incredibly rigid, serialized, self-contained unit that contains the action. The Central Operating Group can be easily moved between grip modules in seconds, allowing for a wide range of customization options. The full-sized Echelon also features an A-CUT slide optics cut that accommodates the included Aimpoint COA with no adapter plates. The slide itself features 4 different engagement surfaces including deep serrations and a flared rear that make it easy to operate in the heat of combat. Cold hammer-forged, Melonite-coated barrel. This model comes with an Aimpoint COA closed-emitter optic mounted directly to the slide. Includes 2 magazines and 3 backstraps. Central Operating Group allows for changes in grip module, etc. Cold hammer-forged, Melonite-coated barrel A-CUT slide optics cut accommodates the included Aimpoint COA Optic Billet machined slide with Melonite finish Oversized trigger guard No manual safety