UTG AR15/M4/M16 Carbine Quad Picatinny Rail System with free float extention

•Clever Top/Bottom 3-piece Covers with Integral Spinal Cords/Alignment Housing for Perfect Fit with Barrel Nut and Round Front Cap
•Includes 19 Top Slots, 23 Bottom Slots, 25 Left/Right Continuous Slots
•Designed with Special Cuts to Fit with the Front Sight, Sling Swivel and Bayonet Lug
•Fits Car. Length Model 4ቫ
•Easy Installation with No Modification to the Barrel