The Springfield Armory Echelon 4.0FC California Compliant Gear Pac bridges the gap between massive range utility and strict state regulations in a 100% roster-approved package. This versatile "crossover" footprint pairs a fast-handling, compact 4-inch slide assembly with the uncompromised leverage and control of a full-size frame grip module. Operating entirely via the revolutionary, self-contained, and serialized Central Operating Group (COG) internal chassis, the design integrates mandatory state features including a visual loaded chamber indicator and a factory magazine disconnect safety mechanism. Ready to deploy immediately out of the box, the precision-milled slide utilizes the patent-pending, pin-driven Variable Interface System (VIS) hosting a pre-installed, co-witnessed Viridian® RFX11 green dot optic. Every factory Echelon California Gear Pac bundle optimizes shooter value by shipping protected inside a premium, heavy-duty nylon zippered range bag accompanied by an expanded payload of four 10-round factory steel magazines.