Springfield Armory(R) Echelon 4.0C is a compact semi-automatic pistol chambered in 9mm. It features a 4 in hammer-forged steel barrel with Melonite finish OD Green polymer grip module and an optics-ready slide with Springfield Armory's Variable Interface System. This striker-fired pistol is supplied with 15-round and 18-round magazine configurations and features the U-Dot sight system.Key Features4 in hammer-forged steel barrel chambered in 9mmCompact semi-automatic pistol with 15-round and 18-round magazine configurationsOD Green polymer grip module with integrated accessory railOptics-ready slide with Variable Interface SystemU-Dot sight system with striker-fired operationSpringfield Armory(R) offers firearms designed for defensive duty sporting and recreational applications. The company combines established firearm designs with modern manufacturing materials and feature sets. Springfield Armory(R) firearms include a broad selection of pistols and long guns designed around reliability practical handling and contemporary shooting requirements.