ZEV Technologies Wedge Lock Hand Guard - The most technologically advanced hand guard on the market today. The ZEV Technologies Wedge Lock Hand Guard attaches to the receiver via an innovative system built around a two-piece Wedge Lock system that tightens down securely with only one screw. - Machined from aircraft grade aluminum to keep the wall thickness thin but still strong enough for any environment. The narrow cross-section of the hand guard provides for an excellent ergonomic grip while the M-LOK negative space mounting system provides a smooth hand-friendly surface in place of Picatinny rails. - ZEV Wedge Lock hand guard features: - Black type III hard anodized aluminum hand guard - Black Nitride coated wedge system - One piece free float design with continuous top rail - Compatible with all mil-spec upper receivers - Compatible with low profile gas bocks - Integral anti-rotation pin compatible with ZEV billet upper ensures consistent alignment of the top rail - M-LOK compatible accessory mounting points for user customization - Internal diameter of 1.225