The Springfield Armory Echelon Full-Size UDT (model EC9459BPAC) is a duty-minded 9mm semi-auto pistol built for serious shooters who want ready-to-run capability and real-world ergonomics, and it ships with a factory-installed Viridian RFX11 green dot with Instant-On and a long 30,000-hour runtime for fast, intuitive aiming in dynamic drills or low-light response. The Echelon FS features a 4.5" hammer-forged steel barrel with a 1:10 twist and durable Melonite finish, an optics-ready billet machined slide to accept red dots, and a medium polymer grip module with a 1.2" width that balances control and concealability for range sessions, competition stages, and duty carry. White-dot front and Tactical Rack U-Dot rear sights give clear iron backup, while the captive recoil system and sub-25 oz unloaded weight keep follow-up shots manageable. At 8" overall length and a compact height that changes with magazine choice, this firearm suits shooters moving between duty rigs and range bags; note that purchase requires an FFL transfer. The combination of Springfield Armory engineering, optics integration, and serviceable controls makes the Echelon FS a versatile 9mm for training, protection, and performance shooting.