Why Drum Magazines are a Bad Idea

Published on January 9, 2020
Duration: 8:48

This video from Forgotten Weapons, hosted by Ian McCollum, analyzes why drum magazines are less common than box magazines despite their higher capacity. McCollum, a recognized expert in historical firearms, details the mechanical complexities, manufacturing difficulties, and logistical disadvantages of drum magazines compared to their more prevalent box counterparts. The analysis covers historical examples like the BAR, Thompson SMG, Suomi KP/-31, PPSH-41, and RPK, highlighting military transitions towards box magazines for improved reliability and field usability.

Quick Summary

Drum magazines are less common than box magazines due to their mechanical complexity, which leads to lower reliability and higher manufacturing costs. Logistically, they are bulky and difficult to carry as spares. Historical examples show a consistent military preference for box magazines for their simplicity, reliability, and ease of field management, despite lower individual capacities.

Chapters

  1. 00:00Introduction & The BAR Question
  2. 00:53Mechanical Complexity and Reliability
  3. 01:21Portability and Logistics
  4. 03:05Historical Case Study: The Thompson
  5. 04:38Evolution of Soviet and Finnish SMGs
  6. 06:34The RPK and Modern Light Support Weapons
  7. 07:55The German MP40/1 Solution

Frequently Asked Questions

Why are drum magazines not more common than box magazines?

Drum magazines are less common because they are significantly more complex to manufacture reliably, prone to feeding issues due to their circular feed path, and logistically cumbersome to carry as spares compared to lighter, more manageable box magazines. This makes box magazines the preferred choice for most military and civilian applications.

What are the main disadvantages of drum magazines?

The primary disadvantages of drum magazines include their complex mechanical design leading to lower reliability, higher manufacturing costs, bulkiness, and difficulty in carrying spare drums efficiently. Their intricate feeding mechanism is more susceptible to malfunctions than the simpler straight-line feed of box magazines.

Which historical firearms used drum magazines and why did they transition away?

Firearms like the Thompson SMG, Suomi KP/-31, PPSH-41, and original RPK used drum magazines. Many militaries transitioned to box magazines due to improved reliability, lower cost, lighter weight, and better logistical support, finding that multiple box magazines offered a more practical solution than single high-capacity drums.

How does the mechanical design of drum magazines differ from box magazines?

Drum magazines require cartridges to feed along a circular path, involving two axes of movement, which complicates the mechanism and increases failure points. Box magazines utilize a simpler straight-line feed, making them inherently more reliable and easier to manufacture.

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