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Magpul Industries

Magpul BEV Block - AR15 / M4

Magpul BEV Block - AR15 / M4
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The BEV Block (Barrel Extension Vise) is an all-in-one, compact vise block tool for AR15/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 mag well vise block to support the lower receiver during maintenance, etc.

Made in U.S.A.


  • 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


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

Additional Info

Additional Info

Manufacturer Magpul Industries
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 (3)

Great, but be careful.Review by
This is a pretty good tool, very useful for mounting your upper and lower receivers in a vise.

However, you run into a higher chance of damaging the index pin on your barrel. To understand how this works, you need to understand the flow of torque.

When you tighten your barrel nut, you eventually need to apply more and more twisting force. This force is called "torque". The vast majority of the friction on a barrel nut is between the nut and the threads on the upper receiver. The more torque you apply, the more things want to twist. When you secure the upper by using the barrel extension (which is what the BEV Block does), you need to transfer the torque to that barrel extension.

In other words, when you torque the barrel nut, the torque goes through the nut, to the upper receiver, THROUGH THE INDEX PIN, to the barrel extension, then to the BEV Block.

The index pin was never made to handle excessive amounts of torque, and you run into a very high chance of snapping it with higher amounts of torque.

The BEV Block is great if you are assembling your rifle and only need to torque the barrel nut to 30ft/lbs (as per mil-spec), or if you have a billet upper receiver (which won't work with a clamshell mount).

However, if your upper was improperly assembled and you need to take off a barrel nut that requires large amounts of torque, you will have a HIGH CHANCE OF DESTROYING YOUR INDEX PIN, RENDERING YOUR BARREL USELESS.

The safest way, by far, is by using a clam shell type block to mount your receiver. It distributes the torque across the entire upper receiver and you run zero risk of breaking your index pin. Unfortunately, this option is not possible for people with a billet upper receiver.
(Posted on 9/12/2016)
No commentReview by
- (Posted on 7/6/2016)
Hard to beat the value!Review by
Best upper/lower block for the price. You can hold lowers by inserting it in the magwell or hold upper by sliding it in the bolt carrier cavity. It then slides into the barrel extension. Put the retainer pin in and torque the barrel nut. Safer on your receiver then a clam shell. (Posted on 12/10/2015)

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