Versatile and innovative, Geissele's MK8 DDC Super Modular Rail is a perfect addition to any AR-platform. It features M-LOK attachment points in the 3, 6, and 9 o'clock positions as well as in the upper 45° quadrants, giving the user virtually unlimited customization options in terms of tactical lights, lasers, fore-grips, and other M-LOK accessories. The lower 45° quadrants feature ample venting to help cool a hot barrel after extended shooting sessions, and also cut down on unnecessary weight. In addition, the MK8 DDC Super Modular Rail is outfitted with Geissele's proprietary 2.25" barrel nut to increase the surface contact where the rail interfaces with the receiver. This increases accuracy and zero repeatability during disassembly/reassembly. Features:M-LOK attachment points in the 3, 6, and 9 o'clock positions and the upper 45° quadrantsVenting in the lower 45° quadrants to dissipate heat and cut down on weightGeissele proprietary 2.25" barrel nut