Aero's Enhanced M-LOK (EM) Handguards provide a lightweight free float design for your custom AR15 build. The M-LOK 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 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 1.78" inside barrel nut cut area diameter Compatible with low profile gas blocks Gen 2 Feature - Quick disconnect sling socket at the 3, 6 and 9 o'clock positions Gen 2 Feature - Additional milling along flats to aid with gripping and add visual appeal Gen 2 Feature - New profile for the continuous picatinny top railSpecifications: Made In America?: Yes Platform: AR15 Series: M4E1 Attachment Type: M-LOK Material: Machined from 6061-T6 aluminum Actual Handguard Length: 9" Aero Precision rail lengths measure from end to end. This is the point of contact at the receiver to the end of the last picatinny slot at the muzzle. Weight: 7.2oz Other: Handguard Screw Torque - 25 in-lbs*Please note - This handguard is specific to the AR15/M4E1 platform. It is not compatible with the M5 .308/M5E1 platform.*This handguard does NOT include the barrel nut. It is intended to be used with an Aero M4E1 enhanced upper receiver.