AT3™ Barrel Nut Wrench for SPEAR M-LOK Handguards and Pro Quad Rails

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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™


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

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

Spare Barrel Nut Wrench for AT3’s Handguards

If you lost the barrel nut wrench for your SPEAR M-LOK handguard or your Pro Quad Rail, or just need a spare, we now offer the wrench on its own.  The wrench fits standard 1/2 Inch drive torque wrenches and breaker bars.  This laser-cut tool provides a precise fit on the wrench flats for the SPEAR and Pro Quad Rail.  Any needs you have for installation and maintenance will be made simple.

Here’s a quick tip: when you’re installing your barrel nut on an upper receiver, make sure your barrel nut wrench is at a 90 degree angle from your torque wrench.  This will provide the most accurate torque for the value you set your wrench to.


  • 1/2 Inch Drive
  • 1-3/16 Inch Inside Diameter
  • Laser-Cut Steel
  • Made in the USA

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.

AT3 Lifetime Warranty Logo

All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.

This includes AT3 Red Dot SightsHandguardsIron Sights, and any other product that carries the “AT3 Tactical” or “AT3™” name. For other brands (ex. Magpul or Troy), please refer to the manufacturer’s warranty policy.

In the event that your AT3™ product becomes unusable, we will repair or replace the product at no charge to you.

If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition. The warranty is fully transferable, but we may require information about the original purchase to validate the authenticity of the product.

If your product is in need of warranty service, please contact AT3 Tactical to start the process

Our contact info is available here. To expedite processing, please provide your order information and description of the defect.

Please note: The AT3 Lifetime Warranty does not cover loss, theft, intentional damage or cosmetic damage that doesn’t affect the performance of the product.

Customer Reviews

Based on 1 review
Works great

I bought the wrench to torque the Handguard on a Wilson Combat. The first wrench I bought was for automotive repair and it was too thick but this one works great for several different types of handguards.

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.