Swap out your factory handguard and upgrade to the Geissele Automatics® MK8 M-LOK® Super Modular Rail – Black. This rail features 7000 series aluminum construction with a Type III anodized hardcoat corrosion-resistant finish so it can take tough use and abuse at the range or in the line of duty. Plus, this rail features a proprietary 2.25” long barrel nut that helps increase the surface contact where the rail interfaces with your rifle’s receiver for a secure, wobble-free fit. This modular rail is specifically designed with integrated M1913 Picatinny rail sections at the fore end of the rail in the 3, 6, and 9 o’clock positions to give you plenty of room and versatility when attaching your favorite weapon-mounted accessories. What’s more, this rail also utilizes Magpul® M-LOK technology at the 3, 6, and 9 o’clock positions and the upper 45° quadrants to be the most versatile and modular handguard so users can tailor it to their specific and unique needs. The MK8 M-LOK Super Modular Rail boasts maximum venting for heat dissipation and helps dramatically reduce the rail's overall weight for better and more intuitive control and improved accuracy with your favorite rifle. Backed by a limited lifetime warranty from Geissele. Compatible with mil-spec M4 upper receivers. Compatibility with billet receiver sets is unknown.