• One-piece free float design
  • Compatible with all Mil-Spec AR-15 uppers
  • Built-in anti-rotation tabs
  • 4140PH Alloy steel Nitride finished QD sling socket on both sides
  • M-LOK slots at 3, 6, and 9 o'clock positions
  • Continuous top rail with rail sections at 3, 6, and 9 o'clock positions
  • No barrel nut shims required for installation
  • Compatible with most known low profile gas blocks


  • Material:
    • Handguard: 6061 Aluminum
    • Barrel Nut: 7075 Aluminum
  • Finish: Anodize
  • Weight (Including Barrel Nut and Hardware):
    • 7.125-Inch: 8.6 oz.
    • 9.125-Inch: 9.8 oz.
    • 12.5-Inch: 11.8 oz.
    • 15-Inch: 13.3 oz.
  • Inside Diameter: 1.31"
  • Height: 2.2"
  • Width: 1.95"


  • Mil-Spec AR-15 upper receiver


  • 1x HDX Handguard
  • 1x Mounting hardware (Requires a 9/64 Hey Wrench for installation, NOT included)
  • 1x Aluminum barrel Nut
  • 1x Barrel Nut Wrench


If you need a quality 7, 9, 12.5, or 15-inch free float handguard that won’t break down with daily real-world use, the CMT Tactical UHPR MOD 4 HDX Hybrid rail may well be the one you’ve been waiting for.

CMT Tactical Building a Better Mouse Trap

Cross Machine Tool doesn’t turn out the same flavor of the month products that other manufacturers make their bread and butter on. CMT products are the result of a commitment to excellence. Every component that CMT manufactures is designed to do its job more effectively with greater strength than comparable products from other sources. The CMT Tactical HDX Hybrid Rail is no exception.

What Heavy Duty Means: The CMT Handguard

The CMT Tactical HDX Hybrid Rail is a true heavy-duty rail intended for extreme duty and daily use. These CMT Handguards are made of extruded alloys for superior strength and feature steel quick disconnect sling socket inserts that are nitride finished for additional hardness. Those QD sockets won’t pull through and let you down even under the strain of flu days carrying a fully outfitted tactical weapon system over rough terrain.

Easy to Install with No Clearance Issues

The Patent Pending CMT 17-4 Cored Steel Rail Mounting attachments on these rails makes mounting a secure and straightforward process with anti-rotate tabs to make timing to your receiver a snap. The CMT Tactical 15-inch free float handguard is designed to install easily over low-profile gas blocks with no clearance issues for either the block or gas tube. In addition to the 15-inch version, Wing Tactical carries a 7, 9, and 12.5-inch version so you can have a rail with heavy duty reliability on everything you carry.

Have a question?

Ask an Expert