The Springfield Armory Ronin AOS Pistol combines a legacy of service with modern features. Built for strength, the Ronin features forged steel slides and frames-carbon steel in the slide and stainless steel in the frame-and a hammer-forged barrel for lasting durability. It includes a standard 5" barrel with a traditional recoil spring assembly and barrel bushing. Enhanced with AOS, the Ronin employs a series of plates fitting popular optics like RMR, Shield, Delta Point Pro, and Docter. Each AOS plate integrates a rear sight, ensuring proper optic height, an intuitive sight picture, and visible co-witnessing in nearly all optic configurations, making the Ronin a versatile, modernized firearm ready for a lifetime of service.FeaturesOptics Ready using Agency Arms AOS Plate Adapter SystemCrossed Cannon GripsNote: AOS optics plates will need to be purchased separately. This gun only ships with a cover plate.