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

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This perfect tool for AR builds that allows installation & removal of barrel nuts, muzzle devices, rifle buffer tubes, and castle nuts.

This tool includes:

  • A barrel nut wrench that can handle delta-rings, free float barrel nuts, and 30mm barrel nuts like the AT3 PROLOK handguard
  • 1/2″ torque wrench adaptor
  • Castle and jam nut wrench (for both old and new style castle nuts)
  • A 3/4″ wrench slot for installation of most muzzle devices
  • A cutout for installing/removing rifle-length buffer tubes


  • Material: 4140 Steel
  • Finish: Powdercoat