Model 4/15 Carbine Length Quad Rails with Free Float Extension;•  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 4/15
•  Easy Installation with No Modification to the Barrel
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