Cross Machine Tool UHPR MOD1 line of handguards are made from 6000 series extruded aluminum and finished with a Milspec Type 3 Class 2 Hard Black anodize. A proprietary 7075 anodized aluminum barrel nut requires no shims for installation. M-LOK mounting slots are placed at the 3, 6, & 9 o’clock positions, and 4 anti-rotation QD sockets provided sling placement on either side, forward or rear, of the handguard. The handguard is compatible with most known low profile gas blocks. Includes barrel nut wrench.