Springfield Armory Ronin AOS 45 Auto (ACP) 5in Blued Pistol - 8 +1 Rounds - The Ronin AOS in .45 ACP 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 5in 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. Features: The Ronin AOS features a two-tone finish, with a stainless steel forged frame and forged carbon steel slide with a beautiful hot salt bluing treatment. Developed in collaboration with Agency Arms, AOS employs a series of plates fitting a wide variety of today's most popular optics. The Ronin AOS Ships with a cover plate. The hybrid smooth/checkered Crossed Cannon wooden grips complement the attractive two-tone finish. Specifications: 5in Forged Stainless Steel, Match Grade, 1: 16in Barrel GI Style Recoil System