Features: Barrel Nut and Wrench Included Features Patented 4140 Heat Treated Torque Plate Continuous MIL-STD 1913 Picatinny Top Rail Two Integral Anti-Rotation QD Sling Sockets Super Slim 1.5” Outside and 1.3” Inside Diameter Seven Sides of M-Lok 5-Slot Polymer M-Lok rail included Fully Dehorned and Deburred 100% Made in the USA- Keeps America Working MI Lifetime Warranty