ORS: DPMS LR-308 Franken Gun Fails

Published on June 5, 2012
Duration: 5:11

This video details troubleshooting a DPMS LR-308 'Franken Gun' built from various parts. Key takeaways include the significant impact of ammunition type (Tula vs. brass) on cycling reliability, the potential for a poor factory trigger to be improved with an AR trigger swap, and the critical role of buffer spring selection. The discussion highlights how environmental factors and shooting technique (shoulder support) can influence firearm performance, especially with underpowered ammunition.

Quick Summary

Troubleshooting a DPMS LR-308 'Franken Gun' reveals critical issues with ammunition and components. Tula ammunition proved underpowered, causing cycling failures, while brass ammunition offered better reliability. The factory trigger was poor, benefiting from an AR trigger swap. The buffer spring is a key component, with a POF unit resolving cycling problems experienced with a DPMS one.

Chapters

  1. 00:00Introduction: DPMS LR-308 Franken Gun
  2. 00:13Building the Franken Gun: Parts and Trigger
  3. 00:35Buffer Spring Issues and Solutions
  4. 00:49Ammunition Testing: Tula vs. Brass
  5. 01:37Bolt and Carrier Assessment
  6. 01:55Magazine Reliability Testing
  7. 03:42Jam During Rapid Fire: Technique Analysis
  8. 04:14Buffer Spring as the Culprit
  9. 04:39Conclusion: Franken Gun Troubleshooting Summary

Frequently Asked Questions

What are common issues with a DPMS LR-308 'Franken Gun' build?

Common issues include unreliable cycling due to underpowered ammunition like Tula, poor factory trigger performance, and incorrect buffer spring selection. Environmental factors and shooting technique can also exacerbate these problems, especially in custom builds.

How does ammunition type affect the reliability of a DPMS LR-308?

Ammunition type significantly impacts reliability. Tula ammunition was found to be underpowered and croned lower velocities, leading to cycling failures. Brass ammunition, such as American Eagle, is recommended for better cycling performance in this specific build.

Can the trigger on a DPMS LR-308 be improved?

Yes, the factory DPMS .308 trigger is described as having a lot of draw and poor performance. Swapping it out for a standard AR trigger can lead to a much better and more reliable shooting experience.

What role does the buffer spring play in a DPMS LR-308 build?

The buffer spring is critical for cycling reliability. Using a DPMS buffer and spring caused issues, while a POF buffer and spring resolved them. The system is described as 'barely powered enough' with certain ammunition, highlighting the importance of the correct spring.

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