How To Tune Your AR-15 Adjustable Gas Block - with Jesse Tischauser - OpticsPlanet.com

Published on December 1, 2015
Duration: 4:18

This tutorial demonstrates how to tune an AR-15 adjustable gas block for optimal reliability. Key steps include starting with the gas block open one turn, incrementally opening it until the bolt locks back on an empty magazine, and then adding a reliability buffer of 0.5 to 1.0 additional turns. Finally, the setting is secured using blue Loctite after recording the adjustment screw's rotation count.

Quick Summary

To tune your AR-15 adjustable gas block, start by opening it one turn. Fire a round and check for bolt lock-back. Incrementally open the block until it consistently locks back, then add 0.5-1.0 extra turns for a reliability buffer. Secure the setting with blue Loctite.

Chapters

  1. 00:00Introduction and Required Tools
  2. 00:45Initial Adjustment and Cycling Theory
  3. 01:24Incremental Tuning Process
  4. 02:21Reliability Buffer and Final Testing
  5. 03:24Securing the Gas Setting

Frequently Asked Questions

What are the essential tools and materials needed to tune an AR-15 adjustable gas block?

You will need ammunition, blue Loctite (medium strength), appropriate Allen wrenches for your gas block adjustment screw, and several magazines loaded with a single round each for testing the cycling.

How do you know if your AR-15 gas block is properly tuned?

The primary indicator is consistent bolt lock-back on an empty magazine after firing a single round. If the bolt fails to lock back or ejects improperly, you need to adjust the gas block.

Why is it important to add a reliability buffer when tuning an AR-15 gas block?

Adding a reliability buffer of 0.5 to 1.0 additional turns ensures the rifle will cycle reliably under various conditions, such as cold weather or when using different types of ammunition.

How do you permanently secure the tuned setting on an AR-15 adjustable gas block?

To secure the setting, screw the adjustment screw all the way in, count the rotations, remove it, apply blue Loctite, reinstall it to the bottom, and then back it out to your recorded number of turns.

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