The Springfield Armory Echelon 4.0C CA Compliant scales down the innovative, modular architecture of the Echelon full-size duty pistol into a carry-friendly, compact profile approved for the CA DOJ Handgun Roster. Chambered in 9mm Luger, this striker-fired pistol features a 4-inch cold hammer-forged steel barrel and a rugged black Melonite finish across its billet-machined slide. It is built entirely around the self-contained, serialized Central Operating Group (COG) chassis system, which allows the internal fire control unit to drop seamlessly into alternative grip sizes. Fully customized to meet strict California safety standards, it incorporates a required magazine disconnect safety and a physical top-mounted loaded chamber indicator (LCI). The patent-pending Variable Interface System (VIS) allows over 30 leading micro optics to mount directly to the slide without adapter plates, co-witnessing perfectly with premium tritium U-Dot night sights and a state-restricted 10+1 capacity.