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Cross Machine Tool (CMT) Tactical UHPR MOD 3 HDX QUAD RAIL

AR-15 Handguard

In stock

Cross Machine Tool (CMT) Tactical UHPR MOD 3 HDX QUAD RAIL

As low as $175.75
Rainier Arms Free Ground Shipping

Heavy Duty Xtreme Rails are built for the rigors of daily use. All HDX™ series rails feature Nitride Hardened steel QD sockets to withstand daily sling carry.


  • Rail: 6000 series extruded Aluminum Milspec Type 3 Class 2 Hard Black anodized
  • Barrel Nut: 7075 Aluminum Type 3 Class 2 Hard Anodized
  • 17-4PH Cored Stainless Steel Rail mounting attachment- Patent Pending
  • Anti rotate tabs time Rail to upper receiver
  • 2 each 4140PH Alloy steel Nitride finished QD sling sockets inserts, 2 on each side
  • No Barrel nut shims required for installation
  • Does not contact or apply side loads to gas tube
  • Inner Diameter of handguard: 1.315"
  • Machine engraved T markings (not laser marked) will show up after paint.
  • Includes barrel nut wrench
  • Barrel Nut diameter: 1.378"
  • Compatible with most known low profile gas blocks
  • Overall rail dimensions1.96" wide x 2.195" height
  • Total weight including mounting hardware and barrel nut:
    • 7": 9 oz
    • 9": 11 oz
    • 12.5": 14 oz
    • 15": 16 oz
  • Made & Assembled in USA
More Information
Product Type AR-15 Handguard
Manufacturer Cross Machine Tool (CMT)
Inside Diameter 1.315"
Color Black
Mount Picatinny
Platform AR-15

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