How to fix “Wobble” between AR Upper and Lower

Published on April 12, 2023
Duration: 2:34

Brian from 1st Shot Tactical demonstrates a simple and effective DIY fix for the common 'wobble' or 'wiggle' between AR-15 upper and lower receivers. This method utilizes readily available foam earplugs to create tension, eliminating play without permanent modification. The technique is presented as a practical solution for owners of mismatched or inexpensive receiver sets.

Quick Summary

The wobble between AR-15 upper and lower receivers is often caused by manufacturing tolerances, especially with inexpensive or mismatched sets. A simple DIY fix involves inserting squished foam earplugs into the lower receiver under the rear takedown pin. These expand to create upward tension, eliminating play without affecting accuracy.

Chapters

  1. 00:00Introduction: AR Wobble Problem
  2. 00:36Understanding the Wobble Cause
  3. 00:56The Earplug Fix: Installation
  4. 01:30Reassembly and Tension Mechanism
  5. 01:55Result: Wobble Eliminated
  6. 02:17Conclusion and Call to Action

Frequently Asked Questions

What causes the wobble between an AR-15 upper and lower receiver?

The wobble is typically caused by manufacturing tolerances between the upper and lower receivers, especially when they are not from a matched set. Inexpensive components like Anderson lowers and Palmetto State Armory uppers are often cited as examples where this can occur.

Is the AR-15 receiver wobble fix permanent?

No, the earplug fix is a temporary and non-permanent modification. The earplugs can be removed if desired, making it a reversible solution for addressing receiver play.

Does AR-15 receiver wobble affect accuracy?

Generally, the wobble between the upper and lower receivers of an AR-15 does not significantly affect the rifle's accuracy. It is primarily an aesthetic and tactile issue that can be annoying to the shooter.

What is the easiest way to fix AR-15 receiver wobble?

The easiest and most cost-effective method demonstrated is using foam earplugs. By inserting them into the lower receiver under the rear takedown pin, they expand to create tension, eliminating the wobble.

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