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CMT Tactical UPUR - 1LH Left Hand Eject Billet Upper Receiver

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CMT Tactical UPUR - 1LH Left Hand Eject Billet Upper Receiver

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The Cross Machine Tool Ultra Precision Upper Receiver Part# UPUR-1LH is the perfect Mate to your UHP-15 lower receiver or would also be a great match with any Mil-Spec lower. The UPUR-1LH is machined from Billet 7075 T6 Aluminum unlike the more commonly used 6061. Using the 7075 T6 aluminum gives the UP-UR a 65% increase in strength & rigidity over 6061 aluminum receivers. The UPUR-1LH is machined on a 5 Axis machining Center to reduce the number of operations/setups required to complete. This machining process allows the highest possible accuracy to be obtained over the traditional 3 or 4 Axis machining method. The UPUR-1LH is designed for increased function, performance & to provide an advanced modern appearance & feel to the AR15 platform weapon system. The Left Hand eject of the UPUR-1LH drastically reduces the amount of gasses exiting the chamber into the face of left handed shooters when shooting suppressed.


The UPUR-1LH is available for order only thru Rainier Arms


  • 5 axis machined from 7075 T6 billet

  • M4 feed ramps

  • Engraved “T” numbers

  • 1913 picatinny Rail flat top

  • Mil Spec Type III class II hard coat anodized Black

  • Shell deflector

  • Forward Assist machined into receiver

  • Increased wall thickness for added rigidity

  • Compatible with Mil spec parts

  • Compatible with most aftermarket handguard/rail systems

  • Lifetime warranty against manufacture defects

  • Comes stripped without forward assist assembly

  • This upper does not support the use of a dust cover

  • Compatible with Stag Arms LH BCG only or comparable

MSRP - $159.50

More Information
SKU UPUR-1LH Left Eject Upper
Manufacturer CMT
Finish No
Barrel Length No
Caliber No
Configuration No
Option AR15
Gas Length No
Height No
Rail Length No
Mount No
Profile No
Reticle No
Co Witness No
Size No