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  1. Absolute lifesaver
    This tool will save you a lot of time and reduce the risk of damaging your upper while working on the barrel. It slides on easily and the locking lugs engage with a loose enough tolerance to fit any manufacturer's barrel extension with wiggle room.
    The one downside is the fact that everything behind the barrel extension will have some freedom to move in the vise. I recommend you brace the barrel with your body to prevent any shifting. Really get in there with your torso and the job will be much easier.

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  2. Top quality part
    Multi use, lock the barrel in place by connecting to the barrel extension. definitely on par with other high quality products like the geissele reaction rod. Highly recommended.

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  3. High Quality Tool
    I wanted to be able to work on my AR uppers and lowers without having to buy multiple tools to do so. The magpul stuff is a little more pricey but The quality is top shelf. This thing feels stout and I have no doubt you could build dozens of ARs using this without even leaving a scratch on it.

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Magpul MAG536 BEV Block

96% of 100
In stock

The BEV Block (Barrel Extension Vise) is an all-in-one, compact vise block tool for AR-15/M4 assembly operations of barrel nuts, flash hiders, etc.

Mounts securely in a vise and provides support for both billet and forged upper receivers. Engages barrel extension with solid steel lugs and full length support shank to prevent flexing. Steel hardness is optimized for durability yet won't damage barrel extension, and Magpul Polymer is used for all other engagement surfaces to protect aluminum receiver. O-ring post uses bolt carrier for additional stability and included Pin keeps upper in proper position.

The BEV can also be turned over and used as a magwell vise block to support the lower receiver while installing or maintaining parts.


  • Provides support for all AR15/M4 upper and lower receivers
  • Solidly engages barrel extension with steel lugs
  • Full-length steel support shank
  • Body made from the same high-quality polymer as other Magpul products
  • Made in U.S.A.


  • BEV™ Block – AR15/M4
    • Weight: 11.2 oz.

You get:

  • (1) Bev block

    Compatible with:

    • AR-15, M16 and M4 rifles

    Installation Difficulty: 

    Installation notes: Just get'er in there

    Model numbers:

    • MAG536