Brownells - Changing An AR-15 Barrel

Published on August 20, 2012
Duration: 7:02

This video details the process of changing an AR-15 barrel, transitioning from an A2 pre-ban to a post-ban configuration. Key steps include properly torquing the barrel nut between 30-80 ft-lbs to align the gas tube and using bubble levels for precise gas block installation. The demonstration emphasizes methodical execution for a reliable firearm.

Quick Summary

The AR-15 barrel nut requires a torque of 30-80 foot-pounds, with the primary goal being the alignment of the gas tube indexing holes. Use bubble levels to ensure the gas block is perfectly upright before tightening set screws for optimal function.

Chapters

  1. 00:00Introduction and Preparation
  2. 00:28Removing the Old Barrel
  3. 01:01Installing the New Barrel
  4. 01:26Torquing the Barrel Nut
  5. 02:38Aligning the Gas Tube
  6. 03:37Handguard and Gas Block Installation
  7. 05:15Leveling and Final Assembly
  8. 06:28Function Check

Frequently Asked Questions

What is the correct torque range for an AR-15 barrel nut?

The AR-15 barrel nut should be torqued between 30 and 80 foot-pounds. The primary goal during this process is to achieve proper alignment of the gas tube indexing holes with the receiver.

How do you ensure the gas tube is properly aligned when installing an AR-15 barrel?

After torquing the barrel nut, check if the gas tube slides easily into its port. If not, continue applying torque up to the 80 ft-lbs maximum to align with the next available indexing hole.

What tools are essential for changing an AR-15 barrel?

Essential tools include an armorer's tool for the barrel nut, a vise to secure the upper receiver, a torque wrench to apply precise force, and bubble levels for accurate gas block alignment.

Why is leveling the gas block important on an AR-15?

Leveling the gas block ensures it is perfectly upright and aligned with the upper receiver's rail. This precise alignment is crucial for proper gas port function and smooth cycling of the bolt carrier group.

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