7.62x39 Pistol Is Alive!

Published on February 10, 2021
Duration: 11:25

This video details troubleshooting and testing of two custom-built firearms: a 7.62x39 pistol and a .308 AR-10. The presenter, Elliott Delp, addresses previous cycling issues by adjusting the gas block alignment on the 7.62x39 pistol and modifying the buffer system. The .308 build also faced cycling problems, with potential causes like a mis-milled charging handle and buffer weight being investigated. The testing reveals partial success with the 7.62x39 pistol using Tula hollow points, but subsequent attempts with Red Army FMJ ammunition encountered feeding and cycling failures.

Quick Summary

Elliott Delp troubleshoots cycling issues on a 7.62x39 pistol and a .308 AR-10 build. The 7.62x39 pistol's problems were linked to gas block alignment, while the .308 faced charging handle and buffer weight concerns. Testing revealed mixed reliability with different ammunition types.

Chapters

  1. 00:00Introduction and Build Overview
  2. 00:27Troubleshooting 7.62x39 Pistol
  3. 00:50Gas Block Alignment Fix
  4. 01:04Troubleshooting .308 AR Build
  5. 01:21Buffer Weight Modification
  6. 01:37Charging Handle Fix
  7. 02:06Ammunition Testing Plan
  8. 02:35Testing 7.62x39 Pistol First
  9. 03:027.62x39 Pistol Build Details
  10. 04:007.62x39 Pistol Test - Tula Ammo
  11. 04:15Last Bolt Hold Open Success
  12. 04:17Testing Red Army Ammo
  13. 04:54Feeding Problems with Red Army
  14. 05:29Failure to Fire
  15. 05:52Retesting with Red Army
  16. 06:32No Bolt Hold Open
  17. 06:4060 FPS Bolt Observation
  18. 07:07Bolt Not Held Back
  19. 07:17Buffer Issue Suspected
  20. 07:30Moving to .308 AR Test
  21. 07:36.308 AR Cycling Problems
  22. 08:24.308 Test Failure
  23. 08:35Testing M80 Ball Ammo
  24. 09:02.308 Test Results
  25. 09:11Failure to Feed (.308)
  26. 09:21No Load (.308)
  27. 09:36Same Problem (.308)
  28. 09:41Won't Extract (.308)
  29. 09:52Back to the Drawing Board
  30. 10:017.62x39 Success Acknowledged
  31. 10:11Viewer Feedback Request
  32. 10:28Component Recap
  33. 11:07Conclusion

Frequently Asked Questions

What were the main cycling issues encountered with the 7.62x39 pistol?

The 7.62x39 pistol initially had cycling problems attributed to an improperly aligned gas block. After correction, it successfully cycled Tula hollow points but experienced feeding and cycling failures with Red Army FMJ ammunition.

What steps were taken to troubleshoot the .308 AR-10 build's cycling problems?

Troubleshooting for the .308 AR-10 included fixing a charging handle that wouldn't latch, adjusting buffer weights by removing a tungsten weight, and testing different ammunition types like M80 ball.

What components were used in the 7.62x39 pistol build?

The 7.62x39 pistol build primarily used Diamondback Firearms components, an Aim Surplus bolt with an extended firing pin, DuraMag magazines, and featured a 10-inch barrel with a mid-length or carbine-length gas system.

Why are 7.62x39 pistols known to have gas issues?

7.62x39 pistols are known to have gas issues, which may be related to the inherent power and pressure characteristics of the 7.62x39mm round itself.

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