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

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

Availability: In stock




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

Additional Info

Additional Info

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


Customer Reviews (7)

No commentReview by Daryl
- (Posted on 7/10/2016)
No commentReview by Daryl
- (Posted on 7/10/2016)
GreatReview by Clay
This is a great looking upper. It was delivered quick. I just switched my rightly DPMS over and was pretty quick and easy, stag left handed bolt carrier group fits great and no problems so far. (Posted on 5/27/2016)
No commentReview by John
Excellent quality and fit. It is far better than the Stag Arms forged upper which is more expensive. I will definitely be ordering another! (Posted on 5/24/2016)
No commentReview by Matt
As a leftie, I am really excited about using this in my build. Have a couple of friends that have used this and been very happy with it. (Posted on 5/20/2016)
This is a great upperReview by CJBadge
Being lefty puts me at disadvantage. Finding good equipment is often a real journey. Somehow I found Rainier Arms and this upper. I also own a Stag Arms lefty AR-15, but I really love this upper. I mated it with a Rainier Arms Ultra Match barrel in .223 Wylde. The upper is solid and fits my Mil-Spec lower perfectly. The barrel mounted without issue and headspaced perfectly. If you are looking to put together a lefty AR, look no further your search is over. I'm buying another for a 300 Blackout... (Posted on 10/2/2015)
Sharp looking excelent finishReview by MiamiNice57
This receiver far exceeded my expectation.
I own at least one receiver of every company that makes a lefty (BHW(1), SA(+5), DPMS,(1) RedX(2)). This will be the only lefty I will purchase from this day forward.
The lefty does not have a dust cover but who needs one when your spitting out shells? You provide and install the forward assist (easy) and your good to go! You wont be let down the upper has an excellent feel and nice sharp lines. The only reason I'm writting this review is because I came back for more….you guessed it they're out of stock…. :( (Posted on 5/30/2015)

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