The Springfield Armory Echelon 4.0FC COA delivers a premium crossover hybrid footprint that combines high-capacity leverage with a fast-handling compact slide layout. Designed around a serialized, modular stainless steel Central Operating Group (COG) chassis, this defensive 9mm features a shortened 4-inch slide assembly mated to an uncompromised full-size frame grip module. The defining structural highlight of the EC9409BFC-COA layout is its factory-integrated Aimpoint® A-CUT slide profile. Rather than relying on traditional multi-piece adapter plate systems, this custom slide direct-mounts the included Aimpoint® COA enclosed-emitter red dot sight straight into the metal using an ultra-low wedge system. This design eliminates intermediate plate hardware to lower height-over-bore metrics and maximize mechanical resistance against shear strain. Complete with tactical co-witnessing black serrated backup iron sights, this hard-use duty bundle packages massive fire-readiness by shipping with an included 17-round flush magazine and a 20-round extended backup.