"The Springfield Armory Echelon 4.5F Semi-Auto Pistol with Gear Pac redefines what a striker-fired duty handgun can be, offering robust capacity, easy optics attachment, and superior modularity. It's built around the Central Operating Group an incredibly rigid, serialized, self-contained unit that contains the action. The Central Operating Group can be easily moved between grip modules in seconds, allowing for a wide range of customization options. The full-sized Echelon also features Springfield's Variable Interface System for easy attachment of over 30 red dots without the need for an adapter plate. The slide itself features 4 different engagement surfaces including deep serrations and a flared rear that make it easy to operate in the heat of combat. 4.5"" cold hammer-forged, Melonite-coated barrel. The Gear Pac comes with a Viridian VFX11 Green Dot Sight, 4 magazines, and soft carry case. Variable Interface System for red-dot attachment with no adapter plates Central Operating Group allows for changes in grip module, etc. 4.5"" cold hammer-forged, Melonite-coated barrel White U-dot sights Billet machined slide with Melonite finish Oversized trigger guard No manual safety Gear Pac includes Viridian VFX11 Green Dot Sight, 4 magazines, and soft carry case"