Knights Armament's URX 3.1 Deluxe Rail Panel Kit contains a large assortment of protective panels and accessories that bolt directly to a Knight's Armament URX III or 3.1 handguard. The lightweight polymer panels are textured for a more secure grip, and help to insulate the support hand from barrel heat after prolonged strings of fire. The Deluxe Kit also includes an ergonomic polymer handstop and 3 polymer Picatinny rail sections that allow the user to install additional tactical accessories to the forend if desired. Installation hardware included. Kit Contents:(1x) 4" Handstop Panel, (2x) 4" Standard Panels, (3x) 4" Slim Panel, (2x) 5.5" Standard Panels, (1x) Handstop, (3x) 8 Rib Rail Sections, (3" Long), (5x) Bottom Rail Nuts, (10x) Short Installation Screws, (1x) Long Installation Screw