Made in USA with Ultimate Precision and Strength * Fits Model 4/15 Carbines with Rails Extending Beyond Front Sight * Aircraft Aluminum Extrusion with Integral Spinal Cords for Alignment, Picatinny Rails with 19 Top Slots, 23 Bottom Slots, 25 Left/Right Slots * Simple Installation, No Gunsmith or Tool Required, Solid Locking Feature for Secure Fit and Zero Retention * 18 UTG Rubber Rail Guards Included