Armscor RIA 5.OE, Striker Fired, Semi-automatic, Polymer Frame Pistol, Full Size, 9MM, 4.91 Barrel, Armor Finish, Black, Optics Ready Slide, Fiber Optic Front Sight, 17 Rounds, 3 Magazines, Includes (2) Optic Plates RIA5.0E Introducing the RIA 5.0E, the E stands for enhanced. That means optics cuts and plates for easy customization and an updated barrel that's crafted with improved materials and slide geometry. It features aggressive serrations for easier manipulation. Combine this with an upgraded elite-series finish, and you have improved performance with a whole lot of visual appeal and attitude. Hand crafted for the ultimate in fit and finish, it's Rock Island's masterpiece. A perfect 10.