Springfield Armory(R) Echelon 4.0FC Gear Pac is a semi-automatic pistol chambered in 9mm Luger. It features a 4 in black Melonite-finished barrel a steel optics-ready serrated slide and a black polymer frame with Picatinny accessory rail. This 10-round configuration features ambidextrous controls and combines the compact 4.0FC Echelon format with the Gear Pac package.Key Features 4 in barrel with black Melonite finish Semi-automatic operation with 10-round detachable magazine Steel optics-ready serrated slide Black polymer frame with Picatinny accessory rail Ambidextrous controls for right- or left-handed operation Gear Pac configurationSpringfield Armory(R) builds modern firearms that blend proven designs with contemporary features for today's shooters. The brand is known for duty-capable handguns and performance-oriented platforms that support optics lights and high-round-count training. Springfield Armory focuses on practical reliability shooter-friendly ergonomics and consistent value across its lineup.