Aero AR15 enhanced quad rail hand guard 15 black. 

• 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 - 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
• 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 rail