Cross Machine Tool UHPR Mod 2 HDX AR-15 Handguard - 13.7"

Manufactured by Cross Machine Tool
Manufactured by Cross Machine Tool
4 Reviews

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Cross Machine Tool has long been known for their high-quality AR-15 parts, and the new UHPR Mod 2 HDX handguards are no exception. Each rail is made of 6000-series extruded Aluminum then are hard anodized for a sleek black finish. The barrel nut is made of 7075 Aluminum, while a patented 17-4PH Cored Stainless Steel rail keeps a secure mount. Anti-rotate tabs time under the rail for timing, and when installed, the rail floats over the gas tube without any points of contact. Each handguard includes 4 QD sling sockets, with two on each side for rear and forward sling mounting. But the best part about this rail is that it only weighs 12 total ounces, hardware included. This is an incredibly lightweight mount that has all the durable materials and reliability features to assure a reliable mounting platform. Plus, all CMT MOD 2 HDX handguards are made and assembled in the USA, so rest assured that there’s a high standard of quality control. This is the UHPR-13.7 Mod 2 HDX rail, meaning that it has a 13.7” length. This is perfect for 16” rifles.

  • 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
  • 4 each Nitrided steel QD sling sockets, 2 on each side/end at the 3 o'clock & 9 o'clock positions
  • No Barrel nut shims required for installation
  • Does not contact or apply side loads to gas tube
  • Inner Diameter of handguard - 1.315"
  • MLOK Slots on all flat sides! (7)
  • Includes barrel nut wrench
  • Barrel Nut diameter- 1.378"
  • Compatible with most known low profile gas blocks
  • 12 oz.-Total weight including mounting hardware
  • Made & Assembled in USA

Cross Machine Tool Co., utilizing the latest machining technologies, offers high quality products that you’ll be excited to own. Cross Machine Tool is a veteran owned business that takes pride in manufacturing products you will own. CMT products exceed military standards, so you can build the best AR style rifle possible.
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Accessory AttachmentM-LOK
BrandCross Machine Tool
FinishHardcoat Anodized
Gas System LengthCarbine
Handguard Length13.7
Inner Diameter1.315
MaterialAluminum - 6061-T6
Weight12 oz.
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

4 reviews

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Awesome Rail

by -

This is my second 13.7 rail that I have purchased from PA and it is just as good as the first one. The mounting system is top notch, the outer dimensions are comfortable, and the overall construction of the rail is true quality. CMT makes great product and thanks to PA for supplying them.

Excellent rail

by -

Fit and finish was great, expected from a great company like CMT. Looked good on a 16" barrel. Would highly recommend

High quality

by -

Great rail for the price, fits great , light and would highly recommend. Cmt is gtg.

BlueCollar Mans Geissele


This rail is very similar in build quality as my Geissele MK8! Solid, solid rail right here. Most m lok rails on the market are to light and thin allowing them to flex way to easy. Don’t see or feel this problem on this CMT! Extremely hard to beat this rail for the money. Great job CMT!