Springfield PX9117LAOS: The Ronin AOS blends strength, reliability and quality in a lightweight design. Its forged alloy frame keeps the weight around 30 ounces for easy carry, while the 4.25\" barrel features a traditional barrel bushing system. The forged hot salt blued slide and stainless steel hammer-forged barrel ensure long-lasting durability. Enhanced with AOS, the Ronin now accommodates modern optics, employing plates that fit a wide range of popular models like RMR, Shield, Delta Point Pro, and Docter. Each plate includes an integral rear sight, ensuring proper optic height, an intuitive sight picture.