The Springfield Armory Echelon 4.5F sets a clear modern benchmark for full-size, striker-fired duty pistols. At its core lies the self-contained, serialized Central Operating Group (COG) stainless steel chassis, allowing the entire inner fire control system to change exterior grip modules in seconds. The premium 4.5-inch hammer-forged steel barrel and billet-machined slide are fully treated with a rugged Melonite finish to minimize long-term cosmetic wear and corrosion. Its revolutionary Variable Interface System (VIS) allows shooters to direct-mount over 30 popular red dot optics footprints low to the slide without relying on weak or clumsy adapter plates. Complete with tactical slide serrations and tritium-powered U-Dot sights, this package ships with both a 17-round flush and a 20-round extended steel magazine for unmatched operational versatility.