Quick Tip: How To Align a Gas Block on an AR-15 Barrel

Published on April 28, 2021
Duration: 1:08

This guide, presented by Caleb from Brownells, details the correct procedure for installing a set-screw type gas block on an AR-15 barrel, specifically when the barrel is dimpled. The key takeaway is to always tighten the rear set screw first, ensuring it engages the barrel's dimple for precise alignment. This method guarantees the gas port in the block will perfectly align with the barrel's gas port, a critical step for proper firearm function.

Quick Summary

When installing a set-screw type gas block on a dimpled AR-15 barrel, always tighten the rear set screw first. The dimple on the barrel is located opposite the gas port, and manufacturers drill the gas block's port based on the rear set screw hole, ensuring perfect alignment when the screw seats into the dimple.

Chapters

  1. 00:05Introduction: AR-15 Gas Block Tip
  2. 00:14Installing Gas Block on Dimpled Barrel
  3. 00:25Dimple and Gas Port Alignment Explained
  4. 00:32Manufacturer's Drilling Process Insight
  5. 00:49Questions & Brownells Tech Line

Frequently Asked Questions

What is the most important step when installing a set-screw gas block on a dimpled AR-15 barrel?

The most critical step is to tighten the rear set screw first. This ensures the gas block is properly aligned with the barrel's gas port, as the rear set screw should seat into the barrel's dimple for precise positioning.

Where is the dimple located on an AR-15 barrel relative to the gas port?

The dimple on an AR-15 barrel is always located on the opposite side of the gas port. This fixed positioning is crucial for manufacturers and gunsmiths to achieve consistent and accurate gas block alignment.

How do manufacturers ensure the gas port in an AR-15 gas block aligns correctly?

Manufacturers use the center of the rear set screw hole on the gas block as a reference point to drill the gas port in the block itself. This ensures that when the rear screw is tightened into the barrel's dimple, the gas ports align perfectly.

Who can I contact if I have questions about installing an AR-15 gas block?

If you have questions or need assistance with AR-15 upper receiver assembly, including gas block installation, you can leave comments on the video or call the Brownells Tech Line for expert help.

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