Cross Machine Tool UPUR-1LH Billet Left Handed AR-15 Upper Receiver

Manufactured by Cross Machine Tool
Manufactured by Cross Machine Tool
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NOTE: Limit 1 per household. Quantities exceeding 1 will not allow checkout.



Are you left handed? Tired of having to deal with ejected shell casing and hot gas exploding right in front of your face? Well, maybe it is time to build a dedicated left handed AR-15 with the Cross Machine Tool UPUR-1LH upper receiver. It features the exact same specs as the standard model but is flipped for left side ejection. If you are not familiar with these models of upper receivers, they are machined from a billet of 7075-T6 aluminum allowing for more precise dimensions and thicker walls for more durability. It is then finished with a type III class II black hardcoat anodizing to protect against corrosion and wear. This upper receiver is compatible with Mil-Spec lowers, upper parts, and charging handles, however, is only compatible with the Stag Arms left hand bolt carrier group or comparable BCGs with the same dimensions. The M4 flat top picatinny rail features engraved T-marks for optic placement. The CMT left handed AR-15 billet upper receiver is made to improve usability with left handed shooters.

  • Machined from 7075-T6 billet aluminum
  • Class III type II hardcoat anodized finish
  • Engraved T-marked flat top upper receiver
  • M4 feed ramps
  • Compatible with Mil-Spec parts except BCG
  • Must use Stag Arms LH BCG or similar
  • Increased wall thickness for improved rigidity
  • Lifetime warranty against manufacture defects through CMT

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 DoorNot Compatible
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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