Leapers UTG Pro Picatinny Rail Mossberg 500 Proudly Designed and Made in USA - The Michigan Difference- Enhanced Precision Material Strength and Quality Control Replacing Our Classic MNT-MB500T - Precision Machined from Aircraft Grade Aluminum with Matte Black Hard Coat Anodize - 5.5 Overall Length with 13 Picatinny Rail Slots for Dot Sights Rear Sights and Flexible Positioning of Magnified Optics for Proper Eye Relief Adjustment - Low Profile See Thru Design Allows Use of Front Sight Bead - Contoured Bottom Perfectly Fits Mossberg® Model 500® with Drilled and Tapped Receiver - Includes Assembly Screws and Tools for Simple and Friendly Installation No Gunsmith Required