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Jacob Grey Firearms Ultralight 5.56 NATO Complete Upper Assembly
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Most Helpful Positive Review Impressive
I don’t normally take the time to do a review but I felt compelled. I purchased the 16” when it was on sale. This is Tier 1 quality @ a great price point. We we’re getting great groups out of the box. I only have about one hundred rounds through it. I will try and do a fallow up after one thousand. ...
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Most Helpful Negative Review Not impressed
This URG has given more problems and joy. Failure to feed issues from day one. RMA'ed but still having issues. The same lower receiver/mags/ammo has had zero issues on a different upper. I would love to give this company the benefit of the doubt, but seeing how I'm still having a problems after RMA...
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Big Let Down

by Tim, Verified Owner from ND, United States Written on January 8, 2026
from day 1 I've had issues with the 13 inch. 1. gas coming out the muzzle due to the muzzle having ports inside the hand guard, flood the handguard with gas pushing it back to the shooters face; every shot feels super hot on your forward hand. 2nd issue was im assuming a factory defect, as the bolt carrier had cracking coming off the top screws of the carrier; I'm assuming from overtightening during manufacturing. These issues were all noticed with the first 15 rounds i put through the upper. For the money spent we should be getting at the very least a mid level product. In trouble shooting the issues, I've replaced the barrel, for a longer barrel as well as the gas block and tube, and the bolt carrier.
Would recommend: No
Was it helpful to you? Yes | No

Jacob Grey upper receiver

by BusaGroot0311, from KY, United States Written on July 31, 2025
Love the upper receiver, I wish the upper portion was wide enough for MLOK inserts. Which there are ways around that by purchasing Kinetic Development Group picatiny rail mounts. Very good quality overall, nothing bad to say.
Pros:
  • good price
  • High quaility
Cons:
  • Can not attach MLOK to the top of the hand guard
Would recommend: Yes
Was it helpful to you? Yes | No

light upper but solid upper receiver.

by Send, Verified Owner from CA, United States Written on October 20, 2022
I love this complete upper receiver. you guys are seriously missing out. comes with bcg and charging handle I’m so happy with this birthday gift of mine for myself. it doesn’t come with a forward assist which i don’t mind. i got the 16” 5.56 model. do yourself a favor and get this.
Pros:
  • light but solid
  • well made & engineered
Cons:
  • No forward assist(but not needed)
Would recommend: Yes
1 of 1 found the following review helpful.
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