Aero Precision's Enhanced Handguard provides a lightweight free float design for your custom AR-15 build. This M-LOK compatible system pushes advanced modularity beyond that of the 1913 picatinny rail system. Machined to MIL-SPEC dimensions and engineered to perfection, this handguard eliminates bulk yet retains strength and stability.NOTE: This handguard requires either a BAR System Barrel Nut (sold separately) or the M4E1 Enhanced Upper Receiver.This handguard has been designed for the AR-15/M4E1 platform. It is not compatible with the M5 .308/M5E1 platform.Features: 1pc free float design Built in anti-rotation tabs Scalloped rails Continuous top rail Compatible with low profile gas blocks Quick disconnect sling socket at the 3, 6 and 9 o'clock positions 1.78" inside diameter