Aero Precision Enhanced Quad Rail (EQ) Handguards provide a lightweight free float design for your custom AR15 build. The EQ system features x4 1913 picatinny rails for advanced modularity and customization. Machined to mil- spec dimensions and engineered to perfection, these handguards eliminate bulk while retaining strength and stability. Features: 1pc free float design Built in anti-rotation tabs Scalloped rails Continuous top rail 1.72" inside diameter (from barrel nut cut to forward end) fits most muzzle devices and 1.5" suppressors Compatible with low profile gas blocks Eliminated half of the 3, 6 and 9 o'clock picatinny rails, saving weight and providing a more ergonomic design in the rear gripping area Quick disconnect sling socket at the 3, 6 and 9 o'clock positions Additional milling along flats to aid with gripping and add visual appeal Profile for the continuous picatinny top rail Note: Designed to work only with Aero Precision Enhanced Uppers with the barrel nut built into the upper receiver. No barrel nut is included.Made In United States of America