Aero Precision AR15 BAR Barrel Nut with Shims

The Aero Precision AR15 BAR Barrel Nut with Shims is the key piece you need to mount an Aero Precision Enhanced handguard onto a standard mil-spec AR-15 upper receiver. If you're running one of Aero's handguards and don't have their M4E1 Enhanced upper (which integrates the barrel nut directly), this is your solution. It's machined from billet 7075-T6 aluminum, anodized black, and built tough enough to handle real shooting without fuss.

The package includes the barrel nut itself plus a shim pack with plenty of material to dial in your handguard alignment during installation. At 2.24 ounces, it adds negligible weight to your build. The design works with mil-spec barrels up to .998" in diameter, covering the vast majority of AR-15 setups. Installation is straightforward with a standard AR-15 armorer's wrench—though note that Magpul's wrench won't fit this nut, so make sure you have the right tool on hand.

Proper torque is important here: Aero recommends between 30 and 45 foot-pounds. Go over 45 and you risk damage to the nut, so don't muscle it. This is one of those foundational parts that doesn't get attention until something's wrong—which means Aero's engineering on this one is designed to make sure nothing ever is.

Key Features

• Machined 7075-T6 billet aluminum for strength and durability
• Anodized black finish resists corrosion and looks clean
• Shim pack included for precision alignment of your handguard
• Compatible with all Aero Precision Enhanced handguards
• Works with any mil-spec threaded AR-15 upper receiver
• Lightweight at 2.24 ounces

Specifications

Frequently Asked Questions

Which handguards does this barrel nut work with?

This barrel nut is designed for all Aero Precision Enhanced handguards. It's the interface piece that lets you mount those handguards to a standard mil-spec threaded upper receiver.

Do I need this if I have an Aero M4E1 Enhanced Upper Receiver?

No. The M4E1 Enhanced Upper has the barrel nut and rail mounting platform forged directly onto it, so you won't need a separate BAR Barrel Nut.

What's included in the package?

You get the BAR Barrel Nut itself plus a shim pack containing 8 shims to help you align your handguard during installation.

What tool do I need to install this?

Use a standard AR-15 armorer's wrench. This nut is not compatible with Magpul Armorer's Wrenches, so verify your tool before you start.