The Echelon from Springfield Armory sets a new standard for modern striker-fired duty pistols. With a host of patent-pending features this modular and highly adaptable handgun is designed around a robust stainless steel chassis and revolutionary optics mounting system. Engineered with superior ergonomics and built to withstand the harshest conditions the Echelon takes its rightful place at the front of the pack. The Echelon from Springfield Armory Unparalleled. At the heart of the Echelon lies the Central Operating Group (COG). Employing cutting edge manufacturing techniques the COG is entirely self-contained and serialized allowing it to be easily moved between grip modules in seconds. Precision built from stainless steel the chassis provides a robust housing for its patent-pending operating system. Concealed beneath the slide cover plate is the Echelons patent-pending optic mounting system. The Variable Interface System (VIS) allows users to mount over 30 optics directly to the slide without the use of adapter plates. Simply configure the self-locking pins for the footprint of your desired optic to achieve a low direct mount for improved sight picture and intuitive alignment. Thoroughly tested for ease of manipulation the Echelons slide features four distinct engagement surfaces. A trench cut forward of the action gives shooters a natural index location for press checks and charging the firearm. The back of the slide is flared for positive purchase while deep forward and rear serrations are carried through the corners for a firm grip from any angle.