The Leapers UTG Pro AR15 Super Slim 15 Free Float Keymod Compatible Rail was designed for flexibility in different applications. Fits carbine length, mid-length, and rifle length AR15 s. Also features integral anti rotation tabs for perfect alignment and Rock-Solid lock up with your receiver. A 37 slot picatinny rail that forms a continuous mounting platform with the receiver. Also includes 2 keymod compatible rail sections, 4 Slot, and 8 Slot for custom accessory options. Product Features Proudly Designed and Made in USA 15" Single Rail, Super Slim, Keymod Compatible, Free-floating Handguard with Proprietary Barrel Nut Design 112 Keymod Compatible Slots on 7 Keymod Compatible Slot Tracks for Mounting Keymod Compatible Rails and Accessories Fits Carbine Length, Mid-Length or Rifle Length AR15s Super Lightweight with 37 Slot Extended Top Picatinny Rail to Form a Continuous Mounting Platform with the Receiver Includes 2 Keymod Compatible Picatinny Rail Sections, 4 Slot and 8 Slot, for Limitless Accessory Customization Options Features Integral Anti-rotation Tabs for Perfect Alignment and Rock-solid Locking with Upper Receiver Ergonomic Octagonal Profile with 96 Well Placed Grooves on Rail Surface for Solid Grip, Air-Accelerated Heat Release and Superior Handling Comfort Scalloped Top Picatinny Rail Edges for No-Snag Easy Accessory Mounting Precision Machined from 6061-T6 Aircraft Grade Aluminum with Hard Black Anodizing Simple and User Friendly Installation with Easy to Follow Instructions Included Designed to Fit with Standard Gas Tube and Barrel Diameter Not Exceeding 1" Not Compatible with Piston System, Re-designed or Over-sized Upper Receivers Product Specifications Material: Aluminum Weight: 12.1 oz Pieces: 1 Rail Type: Keymod No. of Rails: 1 Length: 15.3 inch Width: 1.5 inch Height: 1.97 inch Inner Diameter: 1.34 inch Inner Height: 1.7 inch Channel Width: 0.45 inch