The Leapers UTG Pro Model 4/AR-15 Car Length Drop-In Quad Rail was proudly manufactured in the United States with a keen eye to quality and design. This quad rail system mounts quickly and easily to the barrel of your AR-15 style weapon with no permanent modification to the barrel necessary. Constructed from aircraft-grade aluminum this rail system is built to deliver many years of reliable performance. Features black rubber rail guards to protect against damage in even the toughest of conditions. 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