Springfield Armory Echelon 4.0C Comp Features This model incorporates Springfield's Central Operating Group a serialized internal chassis that provides enhanced modularity and long-term durability. The compensated slide features integrated ports that mitigate muzzle rise making the pistol easier to control during rapid fire. The 4-inch barrel and 1-in-10 twist rate contribute to excellent accuracy across a variety of loads while the black melonite finish ensures lasting protection against wear and corrosion. In addition to the included Viridian RFX11 red dot optic the pistol comes with low-profile 3-dot night sights for enhanced visibility in all lighting conditions. The optics-ready slide supports additional mounting options offering flexibility for future upgrades. With four magazines and a rugged Springfield range bag this Gear Pac provides a complete ready-to-run solution for range or carry use. Springfield Armory Echelon 4.0C Comp Specifications Manufacturer: Springfield Armory Model: Echelon 4.0C Comp Gear Pac Type: Semi-Auto Pistol Action: Striker Fired Caliber: 9mm Capacity: 10 + 1 Magazine Description: 10 rd. Number of Magazines: 4 Barrel Length: 4 Rate of Twist: 1-in-10 Overall Length: 7.25 Frame: Polymer Frame Stock/Grips: Black Polymer Finish: Black Melonite Finish Type: Applied Finish Sights: 3-Dot Night Sights Sight Type: Night Sights Optics Ready Cut: Yes Included Optic: Viridian RFX11 Red Dot Optic Weight: 23.9 oz. Safety Features: Trigger Safety Case: Springfield Range Bag Additional Info: Central Operating Group Additional Info: Compensated Slide