UTG Pro M416S Model 4/15 Carine Length Quad Rails.p- Proudly Designed and Made in USAbr- Clever Top/Bottom Two-piece Design with Integral Spinal Cords/Alignment Housing for Perfect fit with Barrel Nut and Round Front Capbr- Made from Aircraft Aluminum with Precision CNC Machining and Excellent Anodizing/Engravingbr- Fits Car. Length Model 4/15 and Provides Four Picatinny Rails Each with 14 Slotsbr- Great Zero-retention Capability for All Accessories Installed on the Railsbr- Easy Installation with No Modification to the Barrelbr- Black Rubber Rail Guards Included