AT3™ Replacement Barrel Nut for SPEAR M-LOK and Pro Quad Rail Handguards


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Mounted on 1/2 Inch Drive Torque Wrench

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


Replacement Barrel Nut for SPEAR and Pro Quad Rails

This lightweight aluminum barrel nut works with all of the AT3 Tactical handguards. If you’ve damaged or misplaced your barrel nut, this part will work so you can get your build back up to speed in no time. If you don’t have your barrel nut wrench, you can also pick up an AT3 Barrel Nut Wrench here.


  • Compatible Handguards: AT3 SPEAR M-LOK and Pro Quad Rails
  • Finish: Anodized
  • Barrel Nut Material: 7075-T6 Aluminum
  • Barrel nut inside diameter: 1.02” (compatible with barrels up to 1” diameter)
  • Torque Range: 30-60 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.

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.