The Springfield Armory SPG PX9118LAOSPAC 45 1911 RONIN UNT FO 4.25 Gear-Pac is a semi-auto 1911 from Springfields Ronin series built for shooters who want traditional single-action ergonomics with modern optics capability; chambered in .45 Auto with a 4.25" forged stainless match-grade barrel on a fully supported ramp and 1:16 twist, this forged carbon steel slide is blued and optics-ready to accept the factory-installed Viridian RFX11 green dot that features Instant-On technology and a 30,000-hour runtime for fast, intuitive aiming in competitive, defensive, or range environments. The forged aluminum alloy frame carries a satin aluminum Cerakote finish and Crossed Cannon wood laminate grips for a classic look and positive purchase, while the commander-length GI-style recoil system delivers familiar timing and controllable recoil for follow-up shots. Fiber optic front and black serrated rear sights provide clear co-witness options, and the included heavy-duty nylon pistol bag keeps the pistol and accessories protected during transport. At 31 oz and 7.9" overall length with 5.5" height, the Ronin UNT FO balances carryable size with full-size sight radius; this firearm requires an FFL transfer and suits competitive shooters, duty use, and collectors who value a modern optics-ready 1911 from Springfield Armory.