The Springfield Armory Echelon FS UDT 4.5 is a compact, optics-ready 9mm striker-fired pistol from Springfield Armorys Echelon series that brings duty-level durability and range-friendly shootability into a package suited for concealed carry, home defense, and range sessions; its 4.5" hammer-forged steel barrel with Melonite finish and 1:10 twist delivers consistent accuracy and long service life while the billet-machined, optics-ready Melonite slide accepts the factory-installed Viridian RFX11 green dot with Instant-On and a 30,000-hour runtime for rapid target acquisition in low light, and the white-dot front with Tactical Rack U-Dot rear aids traditional sighting when needed. The black polymer medium grip module offers a slim 1.2" grip width for comfortable handling and faster follow-ups, and the captive recoil system helps mitigate felt recoil for improved control. At roughly 24 ounces with a flush magazine, 8" overall length, and an ergonomically balanced height for concealment, this semi-auto handgun is practical for everyday carry or duty use; note that this firearm requires an FFL transfer, and the Gear-Pac includes a heavy-duty pistol bag along with the sighted optic to get you to the range or duty shift with confidence.