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Obsidian Arms AR-15 Upper Receiver Vice Block
$40.00 $38.00 Save $2.00
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Most Helpful Positive Review Works with AR uppers - used with .223, 5.56, and 9mm uppers
I originally got an upper vice block, the one that is two pieces and goes over and covers the upper. It seems to only work with the standard uppers. I got this instead because I have some slick side uppers and 9mm uppers that are different from the standard AR upper design and this still works perfectly. The middle part goes inside of the upper and you just use the included pins that go into the pivot and take down points. So easy and happy I got it. Can confidentially recommend to anyone.
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Heavy Duty upper block

by Crockett Clark, Verified Owner from FL, United States Written on May 13, 2026
Sturdy construction, pins fit tight. Ensured to hold your upper while you install muzzle device or change barrel. Vice did almost zero damage to the clamping surface of the block. Used on my Banshee 9mm which required me to remove the extractor from inside the upper. After that, worked exactly as intended!
Pros:
  • Durable Material
  • Compatibility
  • Fit and Finish (mostly)
Cons:
  • None
Best Used for:
  • ar upper
Would recommend: Yes
Was it helpful to you? Yes | No

She Strong

by Aardwolf, from SC, United States Written on January 20, 2026
Nicely constructed and fits perfectly. It's a strong as any other vice block, however they make reaction rods for a reason. This block will take all the torque I can imagine you needing, this item held strong while a Stanley vice snapped removing a barrel nut (maker's fault, took MAP gas to free it). Solid product at a good price.
Pros:
  • Strong
  • Scratches less
Cons:
  • Not a reaction rod
Best Used for:
  • Cleaning
Would recommend: Yes
Was it helpful to you? Yes | No

A must have!!

by Brian Seery, Verified Owner from TX, United States Written on October 11, 2025
I bought this after watching a video on YouTube about installing a barrel. The video went in depth on vise blocks and action rods. I had already owned a couple different styles for upper receivers to include a action rod but I liked the points that the guy had made about this style of vise block. This was also my first time installing a barrel so I wanted to make sure I had a couple options incase I had any issues. Well I ended up only needing this vise block and I now use it for a lot of the upper receiver tinkering I do with my AR's.
Would recommend: Yes
Was it helpful to you? Yes | No

great product!

by BattleBuilt, Verified Owner from MI, United States Written on February 5, 2025
This is a great upper block, solid and dependable!
Would recommend: Yes
Was it helpful to you? Yes | No

Love this block!

by Scott, Verified Owner from CO, United States Written on September 29, 2024
Has made working on my uppers so much easier! Fits all of my uppers perfectly!!
Would recommend: Yes
Was it helpful to you? Yes | No

precise fit

by Brad, Verified Owner from NM, United States Written on April 27, 2024
This block is the way to go. I used it within a couple days of getting it to swap out a rear charging upper for a new side charging upper, it slid in both uppers nice and tight and the holes for the pins lined up perfectly. I highly recommend Obsidian Arms AR-15 Upper Receiver Vice Block
Would recommend: Yes
Was it helpful to you? Yes | No

great quality, works perfectly for upper recwiver work

by BattleBuilt, Verified Owner from MI, United States Written on April 24, 2024
Couldn’t ask for a better rig for the price. This thing is great quality and the hpde material really allows you to torque it into the vice whereas some metal units I’ve used in the past cannot.
Best Used for:
  • barrel and crush washer installations
  • Muzzle brake / Suppressor mount
  • Gas block
  • Upper reciever
Would recommend: Yes
1 of 1 found the following review helpful.
Was it helpful to you? Yes | No

vice block

by MARK, Verified Owner from MO, United States Written on April 12, 2024
Works great worth the money just to keep from scratching your gun.
it will last many years of working gunsmithing I am not getting anything from this
just letting you know if you buy this for working on your AR you will not regret it
Pros:
  • A +
Cons:
  • None for me
Best Used for:
  • AR Platform
Would recommend: Yes
Was it helpful to you? Yes | No

good vise mount block

by 85cheetahbb, Verified Owner from IN, United States Written on February 24, 2024
Holds the upper very tightly no wiggle or play, Appears to made out of solid delrin.
Pros:
  • Works great
Cons:
  • None
Would recommend: Yes
Was it helpful to you? Yes | No

good vise mount block

by 85cheetahbb, Verified Owner from IN, United States Written on February 24, 2024
Holds the upper very tightly no wiggle or play, Appears to made out of solid delrin.
Pros:
  • Works great
Cons:
  • None
Would recommend: Yes
Was it helpful to you? Yes | No
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Last updated 2025-11-12 UTC.