Brownells - Changing A Gas Block

Published on August 20, 2012
Duration: 5:12

This guide details the process of replacing an A2-style gas block on an AR-15 with a modular gas block, as demonstrated by Monty Crain from Brownells. It covers the removal of the gas tube pin and taper pins, inspection of the gas port, installation and indexing of the new modular gas block, and a crucial function check. The procedure emphasizes using the correct punches to avoid damaging the barrel and ensuring proper alignment for reliable operation.

Quick Summary

This guide demonstrates replacing an AR-15 A2-style gas block with a modular unit. Key steps include removing the gas tube pin and taper pins using specialized punches, inspecting the barrel's gas port for obstructions, installing and indexing the new modular gas block with set screws, and performing a function check to ensure proper gas tube alignment before live fire.

Chapters

  1. 00:00Introduction & Removal Overview
  2. 00:20Removing Gas Tube Pin
  3. 01:04Removing Taper Pins
  4. 01:28Gas Block Removal & Inspection
  5. 02:00Installing Modular Gas Block
  6. 02:30Securing and Indexing Gas Block
  7. 04:30Function Check

Frequently Asked Questions

What tools are needed to replace an AR-15 gas block?

You will need a roll pin punch, a cup point punch, a straight punch, and a 3/32 inch Allen hex key for securing the new gas block with set screws. A tool like the Brownells Front Sight Block can help support the barrel during disassembly.

How do you remove the old gas block from an AR-15 barrel?

First, remove the gas tube pin. Then, use a cup point punch to loosen the taper pins holding the gas block, followed by a straight punch to drive them out completely. Finally, remove the old gas block.

What is important to check after installing a new AR-15 gas block?

After installing the new gas block and securing it, it's crucial to perform a function check. Cycle the bolt and charging handle to ensure the gas tube is properly aligned with the bolt carrier's gas key before test firing.

Why is inspecting the gas port important during gas block replacement?

Inspecting the gas port on the barrel after removing the old gas block is vital to check for any burrs or obstructions. Ensuring a clean gas port guarantees proper gas flow, which is essential for the reliable operation of the AR-15's action.

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