Proudly Designed and Made in USA; Clever Top/Bottom Two-piece Design with Integral Spinal Cords/Alignment Housing for Perfect fit with Barrel Nut and Round Front Cap; Made from Aircraft Aluminum with Precision CNC Machining and Excellent Anodizing/Engraving; Fits Car. Length Model 4/15 and Provides Four Picatinny Rails Each with 14 Slots; Great Zero-retention Capability for All Accessories Installed on the Rails; Easy Installation with No Modification to the Barrel; Black Rubber Rail Guards Included