Four Mil-spec Picatinny Rails for Versatile Accessory Applications, Simple and Friendly Installation, No gunsmith or Tool Required * Interlocking System Features Lower Mount Mating with Upper Mount for Most Solid and Secure Fit, Includes a Special Slot to Accommodate Rear Iron Sight Specially Designed Groove Rail Top for Optimal Viewing Through Front Sight. * 33 Top Slots, 25 Left and Right Side Slots and 6 Bottom Slots * A Complete and Most Affordable Tactical Solution Offering Endless Options of Scope, Flashlight, Laser, Bipod, Foregrip on Your Favorite 10/22 Rifles * Black Rubber Rail Guards Included