Springfield Armory Echelon Central Operating Group Features The Central Operating Group is manufactured using advanced processes and precision machining delivering exceptional durability and tight tolerances through its robust stainless steel construction. As the serialized component of the Echelon platform the COG allows complete custom builds using compatible OEM and aftermarket components letting shooters select their own grip module slide assembly barrel sights and accessories around this proven operating core. For shooters who want to build a fully personalized Echelon pistol the serialized COG delivers the proven foundation needed to mix and match compatible components. A takedown lever is built into the Central Operating Group locking the unit securely into compatible Echelon pattern frames for a reliable mechanical connection. The flat-faced trigger includes an integrated safety and promotes consistent finger placement and a controlled pull shot after shot. At just 4.3 inches long and 3 oz the COG keeps the core of the build compact and lightweight before grip module and slide components are added. For shooters who want a consistent controlled trigger pull as the foundation of their custom build the COG's flat-faced trigger with integrated safety delivers that control from the start for sale at GrabAGun. Springfield Armory Echelon Central Operating Group Specifications Manufacturer: Springfield Armory Model: Echelon Central Operating Group Type: Serialized Pistol Core Unit Caliber: 9mm Material: Stainless Steel Trigger: Flat-Faced with Integrated Safety Takedown Lever: Yes Frame Compatibility: Echelon Compatible Magazine Compatibility: Echelon Pattern Color: Black Length: 4.3 Weight: 3 oz Available At: GrabAGun