Our Enhanced KeyMod (EK) Handguards provide a lightweight free float design for your custom AR15 build. The KeyMod system allows advanced modularity past the current 1913 picatinny rail system. Machined to mil-spec dimensions and engineered to perfection, this handguard eliminates bulk while retaining strength and stability.Features:1pc free float designBuilt in anti-rotation tabsScalloped railsContinuous top rail1.78″ inside diameter fits most muzzle devices and 1.5″ suppressorsCompatible with low profile gas blocksGen 2 Feature – Quick disconnect sling socket at the 3, 6 and 9 o’clock positionsGen 2 Feature – Additional milling along flats to aid with gripping and add visual appealGen 2 Feature – New profile for the continuous picatinny top railAre you attaching this handguard to a standard threaded upper receiver?Make sure to select “Yes” under the Bar Barrel Nut option above (shims included). Our handguards use the BAR interface and do not work with a standard barrel nut. If you are using our M4E1 Enhanced Upper Receiver, no additional pieces are needed. Purchased with a handguard, the BAR Barrel Nut is $20 ($40 when sold separately).*Please note – This handguard is specific to the AR15/M4E1 platform. It is not compatible with the M5 .308/M5E1 platform.