The Springfield Armory Echelon 4.5F CA Compliant brings the highly adaptable, modular architecture of Springfield's premier full-size duty pistol to restrictive states as a California Roster-approved model. Chambered in 9mm Luger, it features a 4.5-inch cold hammer-forged steel barrel and a rugged black Melonite finish across its billet-machined slide. Built entirely around the modular, serialized Central Operating Group (COG) chassis system, the fire control unit can easily drop into different grip sizes. Fully customized to meet strict California safety standards, this model incorporates a required magazine disconnect safety and a tactile 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, aligning perfectly with standard tritium U-Dot night sights and a state-compliant 10+1 capacity.