Does the Magazine Matter? Fixing a Double Feed

Published on August 22, 2021
Duration: 13:53

This video provides a detailed explanation and demonstration of how to identify and clear a true double feed malfunction in an AR-15 platform rifle. The instructor differentiates between a simulated double feed (failure to extract) and a genuine double feed, emphasizing that the latter requires a different clearing procedure. The video also explores whether magazine type (polymer vs. metal) impacts the occurrence and clearance of double feeds, presenting experimental data.

Quick Summary

Clearing a true double feed in an AR-15 involves identifying the malfunction, attempting to relieve bolt tension, and if necessary, locking the bolt to the rear and manipulating the firearm upwards and inwards. Avoid excessive charging handle use, which can worsen the jam. While testing suggested metal magazines might self-clear better than polymer ones, results were inconclusive.

Chapters

  1. 00:00Introduction and Course Information
  2. 00:30Simulated Double Feed (Failure to Extract)
  3. 01:24What a Real Double Feed Looks Like
  4. 02:21Does the Magazine Matter? Testing Different Mags
  5. 03:07Test Setup: Del-Ton Rifle and Magazines
  6. 04:11Del-Ton Rifle Overview
  7. 06:56Malfunction Testing Time Lapse
  8. 08:19Explaining the Double Feed Mechanism
  9. 09:31Clearing Techniques for Double Feeds
  10. 10:16Why This Video Was Made: Magazine Impact
  11. 10:45Data Analysis: PMAG vs. Duramag
  12. 12:16Four Modes of Double Feed Occurrence
  13. 13:23Conclusion and Viewer Engagement

Frequently Asked Questions

What is the difference between a true double feed and a failure to extract in an AR-15?

A true double feed involves two rounds attempting to enter the chamber simultaneously, often caused by magazine feeding issues. A failure to extract is when a spent casing or a round fails to eject properly, frequently due to a damaged case rim or extractor problem, and usually requires tools to clear.

How do you clear a true double feed malfunction in an AR-15?

To clear a true double feed, first try relieving bolt tension. If that fails, lock the bolt to the rear. If rounds remain stuck, avoid excessive charging handle manipulation. Instead, try manipulating the firearm upwards and inwards to dislodge the rounds. Tools may be necessary for severe jams.

Does the type of magazine affect AR-15 double feed malfunctions?

Testing in this video suggested that metal magazines (like C Products Defense Duramags) might be slightly better at self-clearing double feeds compared to polymer magazines (like PMAGs). However, the results were not statistically significant and further testing would be required for definitive conclusions.

What are the common causes of double feed malfunctions in firearms?

Double feeds can occur due to issues with magazine cleanliness, disrepair, user-induced errors, or a magazine that is not properly designed or functioning for the firearm. The flexibility of polymer feed lips is also cited as a potential contributing factor.

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