Lightweight Design with Slim Profile Barrel Nut, Screws, and Barrel Nut Wrench Included Features Patented 4140 Heat Treated Torque Plate for Simple Installation Available in 10.5", 12.625", 14", and 15" lengths One Piece Free Float Design 7.6oz, 8.7oz, 9.2oz, and 9.7oz Installed Weight Rugged 6061 Aluminum Type 3 Hard Coat Anodized MIL-STD 1913 Picatinny Top rail Two Integral Anti-Rotation QD Sling Sockets Super Slim 1.5" Outside and 1.3" Inside Diameter 4 Sides of M-Lok Slots 5-Slot Polymer M-Lok rail included Fully Dehorned and Deburred 100% Made in USA- Keeps America Wo Mfg: Midwest Industries, Inc.