The Springfield Armory Echelon 4.5F COA 15-Round delivers premium full-size service capabilities combined with structural enclosed-emitter red dot precision, custom-packaged for capacity-regulated jurisdictions. Built entirely around Springfield's serialized, modular stainless steel Central Operating Group (COG) chassis, this defensive 9mm features a full-length 4.5-inch hammer-forged steel barrel coated in a hard-wearing Melonite® treatment to yield elite downrange velocity and consistency. The signature highlight of the EC9459B-COA-15 configuration is the integration of the Aimpoint® A-CUT factory slide interface. Rather than utilizing intermediate multi-piece adapter plate platforms, this slide architecture direct-mounts the included Aimpoint® COA enclosed-emitter red dot sight straight into a deep dovetail wedge system cut right into the slide. Eliminating standard plate hardware drastically minimizes height-over-bore measurements, reduces tolerance stacking, and shields mounting fasteners from high shear strain. Outfitted with black serrated co-witnessing tactical irons, this duty-ready setup ships from Geneseo bundled with two 15-round factory steel magazines.