Cross Machine Tool UPUR-3 Billet AR-15 Upper Receiver - Slick Side No Dust Cover - .458 SOCOM Compatible

Manufactured by Cross Machine Tool
Manufactured by Cross Machine Tool
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Looking for something to change up the standard AR-15 formula? This Cross Machine Tool Ultra Precision Upper Receiver is designed for big bore AR-15 calibers and is compatible with Mil-Spec lower receivers. The UPUR-3 is machined from a billet of 7075-T6 aluminum allowing for a custom look and precise dimensions and is much stronger than traditional 6061 aluminum. This Billet AR-15 upper receiver features a slick side design without the forward assist and the enlarged ejection port is compatible with .458 SOCOM, so you can build a precision rifle or a big bore hunting rifle. It is machined with an increased wall thickness for rigidity and the carrier bore diameter is precision cut to ensure consistent and smooth function. The flat top picatinny rail features T-marks to keep track of your optic position if you remove it often and is compatible with standard charging handles. This CMT Slick Side AR-15 Upper Receiver is compatible with a wide range of parts, so you can build your dream rifle.


  • Machined from billet 7075-T6 aluminum
  • Hardcoat anodized
  • Engraved T-marks and 1913 picatinny rail
  • Increased wall thickness
  • Precision cut carrier bore diameter
  • .458 SOCOM sized ejection port
  • No forward assist, shell deflector, or dust cover
  • M4 feed ramps
  • Compatible with Mil-Spec lowers and parts

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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BrandCross Machine Tool
Feed RampsM4
FinishAnodized Black
Forward AssistIncompatible
Manufacturer.Cross Machine Tool
Port DoorNot Compatible
Receiver Material7075-T6 Aluminum
T MarksT-Marked
Weight7.7 oz

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

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