Slow Motion: PKM Machine Gun

Published on September 24, 2014
Duration: 3:38

This video provides a detailed slow-motion analysis of the PKM general-purpose machine gun's operation. It highlights the open-bolt firing mechanism, the spring-loaded dust cover's actuation by the bolt carrier, and the unique pull-out belt feed system. The presenter, with clear expertise, explains how the enlarged and inverted AK action functions, emphasizing the delay between trigger pull and firing due to the bolt's travel.

Quick Summary

The PKM machine gun operates as an open-bolt system, featuring a spring-loaded dust cover actuated by the bolt carrier. Its action is an enlarged, inverted version of the AK platform, utilizing a pull-out belt feed mechanism for continuous fire.

Chapters

  1. 00:02Introduction to the PKM
  2. 00:08Dust Cover and Open Bolt Operation
  3. 00:25Left Side Ejection Port View
  4. 00:32Muzzle Blast and Gas Port Venting
  5. 00:48Rear Sight Bounce
  6. 00:54Filming Speed (2000 FPS)
  7. 01:05Right Side Feed Port View
  8. 01:10PKM Belt Feed Mechanism
  9. 01:28Comparison to AK Action
  10. 01:40Slow Motion Receiver Close-up
  11. 01:49Left Side Receiver Detail
  12. 02:02Bolt Carrier Cycling and Dust Cover
  13. 02:05Delay Between Trigger Pull and Fire
  14. 02:19Trigger Release and Final Shot
  15. 02:35Bolt Lock Open
  16. 02:43Feed Side Delay Analysis
  17. 03:03Rear Sight Bounce and Ammo Feed
  18. 03:21Overall Assessment of the PKM

Frequently Asked Questions

How does the PKM machine gun's dust cover operate?

The PKM's dust cover is spring-loaded and actuated by a cam on the side of the bolt carrier. It automatically opens as the bolt moves forward and is pushed open again as the bolt carrier cycles backward.

What makes the PKM's firing mechanism unique?

The PKM operates on an open-bolt system. This means the bolt is held to the rear until the trigger is pulled, at which point it travels forward to chamber and fire a round, creating a slight delay between trigger pull and ignition.

How is the PKM's action related to the AK platform?

The PKM's internal action is described as an enlarged and 'flipped upside down' version of the AK action. This design shares fundamental operating principles with the iconic AK rifle.

What is the PKM's belt feed system?

The PKM uses a pull-out belt feed. On the bolt carrier's return stroke, claws extract a cartridge from the belt, align it, and then the bolt carrier chambers and fires it on the forward stroke.

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