The Springfield Armory Echelon 4.0FC CA Compliant is a specialized duty-grade hybrid handgun added to the CA DOJ Handgun Roster. It seamlessly merges the fast-handling handling of a compact 4-inch billet-machined slide assembly with the commanding control and ergonomics of a full-size grip module (FC). Built entirely around the modular, serialized Central Operating Group (COG) chassis, the firearm incorporates required California modifications, including a magazine disconnect safety and a visual, top-mounted loaded chamber indicator (LCI). The revolutionary Variable Interface System (VIS) allows over 30 leading micro red dots to mount directly to the slide without adapter plates, pairing with standard tritium U-Dot night sights and a state-restricted 10+1 capacity.