I RUINED MY $2,000 GUN!!

Published on November 15, 2023
Duration: 11:17

This video details troubleshooting a 300 Blackout AR-15 build experiencing bolt lockback failures, particularly when suppressed and using subsonic ammunition. The presenter explores adjustments to an adjustable gas block and the critical role of the buffer and buffer spring combination in achieving reliable cycling. The discussion highlights how different buffer tube lengths and buffer weights can impact performance, offering insights for users facing similar issues.

Quick Summary

Troubleshooting AR-15 bolt lockback failures with suppressors often involves adjusting the gas block and tuning the buffer system. Insufficient gas pressure, especially with subsonic ammo, can prevent the bolt from cycling fully. Experimenting with buffer weights, buffer springs (including suppressor-specific ones), and ensuring compatibility between buffer tube length and buffer size is key to reliable suppressed operation.

Chapters

  1. 00:01Initial Sound Check
  2. 00:52Introducing the 300 Blackout Build
  3. 01:11SBR Stamp and Law Tactical Folder
  4. 01:30Accessory Upgrades (Grip, Light)
  5. 01:52Suppressor Setup (Hyperion K)
  6. 02:00Bolt Cycling Issue Identified
  7. 02:14Adjustable Gas Block Installation
  8. 02:23Goal: Subsonic & Supersonic Shooting
  9. 02:52Buffer Spring Swap Discussion
  10. 03:11First Suppressed Shots
  11. 03:32Testing Subsonic Ammunition
  12. 04:03Subsonic Ammunition Test 2
  13. 04:34Troubleshooting Loudness and Cycling
  14. 05:28Increasing Gas Flow
  15. 06:02Post Gas Adjustment Results
  16. 06:35Continued Cycling Failures
  17. 07:04Failure to Feed Diagnosis
  18. 07:16Bolt Travel Comparison
  19. 07:25Budget Build Comparison
  20. 08:01Buffer and Buffer Spring Analysis
  21. 08:15Buffer Tube Length Impact
  22. 08:37Pistol Buffer Discussion
  23. 08:48Considering Original Configuration
  24. 09:07Return to Original Plan
  25. 09:11Suppressed Spring and Smaller Buffer
  26. 09:25Buffer Swap Plan
  27. 09:59Final Troubleshooting Steps
  28. 10:45Next Steps: Buffer Change
  29. 11:04Conclusion and Process Recap

Frequently Asked Questions

What are common causes of AR-15 bolt lockback failures when using a suppressor?

Common causes include insufficient gas pressure reaching the bolt carrier group, especially with subsonic ammunition. This can be due to an improperly adjusted gas block, the wrong buffer spring tension, or an incompatible buffer weight and buffer tube length for suppressed operation.

How can an adjustable gas block help with suppressed AR-15 cycling issues?

An adjustable gas block allows you to precisely control the amount of gas directed to the bolt carrier group. By increasing gas flow, you can provide more energy to cycle the bolt fully, overcoming issues caused by suppressors or subsonic ammunition.

What is the role of the buffer and buffer spring in AR-15 cycling?

The buffer and buffer spring work together to absorb recoil and return the bolt carrier group. The spring provides the force to push the bolt forward, while the buffer absorbs the impact. Their weight and tension are critical for proper cycling, especially with the reduced gas impulse from suppressors.

Can a full-size AR-15 buffer cause cycling problems with a shorter buffer tube?

Yes, a full-size AR-15 buffer and buffer tube are designed for a specific length of bolt travel. If you use a shorter buffer tube (like with a folding adapter), a full-size buffer might not allow the bolt to cycle fully, leading to feeding or lockback issues.

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