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How do I install or remove a barrel?

Overview

Installing and removing a barrel will take some specialty tools and following these directions.

Install a Barrel

Specialty tools required are an Armorer's wrench, 1/2" drive torque wrench ( installing bbl nut ), 1/2" drive breaker bar ( removing bbl nut ), Armorer's Action block or Barrel Vise Jaw Blocks, 4" vise minimum and a 1/16" drift punch.

  • To install a barrel you need to place the barrel in vise jaw blocks or the receiver in an Armorer's Action Block in a 4" vise.
  • The threads on the upper receiver should be lubed with molybdenum disulfide grease.
  • Install the barrel with delta ring kit installed into the upper receiver with the index pin of the barrel extension in the index slot of the upper receiver.
  • The barrel nut should be torqued on to 32 to 45 ft lbs using an Armorer's barrel wrench.
  • If needed back off and reinstall until a notch in barrel nut lines up with gas tube hole in receiver for the installation of the gas tube.
  • Never back off the barrel nut for this alignment.
  • Install the gas tube into the receiver through the front of the receiver until it clears the front sight base.
  • Then align the tube and insert it into the front sight base.
  • Install the gas tube roll pin and handguards.
  • Check the gas tube alignment with the bolt carrier without the bolt installed.
  • If the alignment is correct the bolt carrier key will not bind on the gas tube.

Remove a Barrel

Specialty tools required are an Armorer's wrench, 1/2" drive torque wrench ( installing bbl nut ), 1/2" drive breaker bar ( removing bbl nut ), Armorer's Action block or Barrel Vise Jaw Blocks, 4" vise minimum and a 1/16" drift punch.

  • Remove the barreled upper receiver assembly from the lower receiver assembly.
  • Remove the charging handle and bolt carrier assembly.
  • Remove the handguards.
  • Use the 1/16" drift punch to drift out the gas tube roll pin in the sight base.
  • Pull the gas tube back into the receiver until it clears the handguard cap then pull it out of the receiver past the front sight base.
  • To remove the barrel nut place the barrel in Barrel Vise Jaw blocks or the receiver in an Armorer's Action block in the vise.
  • Remove the barrel nut with the Armorer's wrench on the 1/2" drive breaker bar.
  • The barrel will now pull out of the upper receiver.
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