Cross Machine Tool UPUR-1A Billet AR-15 Upper Receiver - 458 SOCOM

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 a .458 SOCOM build by enlarging the ejection port and increasing the wall thickness for greater durability. Still compatible with Mil-Spec AR-15 lowers, the UPUR-1A 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 unique design with a forward assist slot and shell deflector and is compatible with Mil-Spec parts. The bolt carrier bore is precision machined to ensure smooth and consistent function with the BCG. The flat top picatinny rail features T-marks to keep track of your optic position if you remove it often and the entire receiver is hardcoat anodized for additional corrosion resistance. This CMT Stripped 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 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
FinishHardcoat Anodized
Forward AssistAccepts Standard Forward Assist
Port Door
Receiver Material7075-T6 Aluminum
T MarksT-Marked

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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