Fab GL Core vs Classic M4 - Which Wins?

Published on May 14, 2026
Duration: 2:09

This video demonstrates a 'wiggle test' to compare the stability of the Fab Defense GL Core stock against a classic M4 stock. The test involves taping a Sharpie to the stock and measuring the travel distance when wiggled. The Fab Defense GL Core showed significantly less movement, indicating superior tightness and solidity.

Quick Summary

The Fab Defense GL Core stock offers superior stability compared to a classic M4 stock, measuring only 6.27 mm of movement in a 'wiggle test' versus the M4's 16.37 mm. This indicates a much tighter and more solid fit, though installation can be slightly tricky due to its snugness.

Chapters

  1. 00:02Introduction: Fab Defense GL Core Inquiry
  2. 00:30First Impressions: GL Core Installation
  3. 00:43The Wiggle Test Setup
  4. 01:24Fab Defense GL Core Wiggle Test Results
  5. 01:36Classic M4 Stock Wiggle Test
  6. 01:48Comparison and Conclusion
  7. 02:02Further Comparisons

Frequently Asked Questions

How does the Fab Defense GL Core stock compare in stability to a classic M4 stock?

In a 'wiggle test', the Fab Defense GL Core stock showed only 6.27 mm of movement, indicating a very tight and solid fit. In contrast, a classic M4 stock exhibited 16.37 mm of movement, demonstrating significantly more play.

What is the 'wiggle test' for firearm stocks?

The 'wiggle test' is a practical method to assess a stock's stability. It involves securing a marker to the stock and measuring how far it travels on a surface when the stock is wiggled back and forth, quantifying looseness.

Is the Fab Defense GL Core stock difficult to install?

The Fab Defense GL Core stock is described as 'really tight' and 'solid' upon installation. While this contributes to its stability, it can be 'a little bit tricky to get on there at first'.

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