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



Aero BAR Barrel Nut for Threaded Upper Receivers

The BAR barrel nut from Aero Precision connects Enhanced M-LOK Handguards to standard threaded upper receivers. This barrel nut supports the wide internal diameter of the Enhanced handguards and includes eight 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. Remember that the barrel nut’s torque 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.
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