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.