Aero Precision BAR Barrel Nut for Enhanced and Quantum AR-15 Handguards

SKU: APRH100268

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Armorer's Wrench for AR-15 & Multi-Function Tool by AT3™

Armorer's Wrench for AR-15 & Multi-Fuction Tool by AT3™


Aero BAR Barrel Nut for Threaded Upper Receivers

The BAR barrel nut from Aero Precision is used to connect Enhanced M-LOK Handguards to standard threaded upper receivers. This barrel nut supports the wide internal diameter of the Enhanced handguards, and includes 8 timing shims for a clean installation.

Note: Compatible with mil-spec threaded upper receivers ONLY. This part is not required for M4E1 Enhanced or Slick Side Enhanced Aero Uppers.

How Do I Install this?

You can view the BAR Barrel nut installation instructions here. Keep in mind that the torque of the barrel nut should not exceed 45 ft lbs.


  • BAR Barrel Nut
  • BAR Shim Pack (8 shims)


  • Machined from Billet 7075-T6 Aluminum
  •  Anodized Black
  • Torque with standard AR-15 armorer’s wrench (Does not work with Magpul® Armorer’s Wrench)
  • Supports Mil-Spec AR-15 barrels with outer diameters up to .998”


  • Material: 7075-T6 Aluminum
  • Finish: Anodized
  • Weight: 2.24 oz.
  • Recommended torque: 30 – 45 ft lbs.

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

Aero Precision Warranty

If for any reason you have a warranty issue with one of our products, please contact us at 253-272-8188.

Please describe your situation, include your name and order number or transaction id. One of our technical specialists will then review your claim and contact you within 3-5 business days.

If you have images to send, please email them to

Damaged Items

In regards to claims dealing with damaged or blemished products, we ask that you create a Help Desk Ticket on your My Account page. If you don’t have an account with us, please go to the Contact Us page and fill out the form for review within 72 hours upon receiving the shipment.

If you have images to send, please email them to

Failed Background Check

There will be a 30% restocking fee on all lower receivers returned because of failed background checks.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.