The Springfield Armory Echelon 4.5F COA delivers uncompromised full-size service capabilities combined with structural enclosed-emitter red dot precision straight from the factory. Built entirely around Springfield's serialized, modular stainless steel Central Operating Group (COG) chassis, this 9mm duty pistol features a 4.5-inch hammer-forged steel barrel coated in a hard-wearing Melonite® treatment to yield premium velocity and long-term downrange consistency. The true hallmark of the EC9459B-COA configuration is its integrated Aimpoint® A-CUT slide profile. Rather than relying on traditional multi-piece adapter plate platforms, this slide direct-mounts the included Aimpoint® COA enclosed-emitter optic into a rugged dovetail wedge system cut right into the slide. This architecture completely eliminates transitional plates, lowering the height-over-bore metrics while insulating the system against hard cycling forces. Topped with co-witnessing black serrated irons, it stands fully field-ready out of the box with an included 17-round flush magazine and a 20-round extended backup payload.