Cross Machine Tool UHPR MOD 4 HDX Hybrid M-LOK AR-15 Handguard 12.5"

Cross Machine Tool UHPR MOD 4 HDX Hybrid M-LOK AR-15 Handguard The Cross Machine Tool UHPR MOD 4 HDX Hybrid M-LOK Handguard is built for hard use and daily sling carry, combining rigid construction with premium attachment points. Part of CMT's HDX(TM) (Heavy Duty Xtreme) line, this rail features nitride-hardened steel QD socket inserts to resist wear over time-ideal for rifles that live on a sling and see regular training or duty use. The rail's hybrid design delivers a clean M-LOK setup with a robust mounting system that includes a 7075 aluminum barrel nut and a 17-4PH stainless mounting attachment. Anti-rotation tabs lock the rail to the upper receiver, and the design avoids side-loading the gas tube. With a 1.315" inner diameter, it clears most low-profile gas blocks, and installation is simplified with no barrel nut shims required. Includes a barrel nut wrench for easy setup. Features HDX(TM) design with nitride-hardened steel QD socket inserts (2 per side) 6000 series extruded aluminum rail with Type III Class 2 hard anodizing 7075 aluminum barrel nut with Type III Class 2 hard anodizing 17-4PH stainless rail mounting attachment (patent pending) Anti-rotation tabs time rail to upper receiver No barrel nut shims required Designed to avoid gas tube side load Machine-engraved T-marks that remain visible after paint Compatible with most low-profile gas blocks Includes barrel nut wrench Made and assembled in the USA Specifications Inner Diameter: 1.315" Barrel Nut Diameter: 1.378" Overall Rail Dimensions: 1.96" W x 2.195" H QD Inserts: 4 total (2 each side), 4140PH nitride finished Finish: Mil-Spec Type III Class 2 hard anodized (rail and barrel nut) Material (Rail): 6000 series extruded aluminum Material (Barrel Nut): 7075 aluminum Material (Mount): 17-4PH cored stainless steel Mounting: M-LOK hybrid design with anti-rotation tabs Origin: Made & assembled in the USA