The PTR 51P PDW is Back

Published on November 12, 2020
Duration: 5:53

This video details the return of the PTR 51P PDW after experiencing significant reliability issues. The primary cause was identified as an incorrect locking piece (70-degree instead of 55-degree) intended for a standard MP5 barrel being used in a .308 caliber firearm. PTR Industries replaced the serialized upper receiver and provided a new hammer, returning the firearm to factory configuration. Chronograph testing showed the 8-inch barrel .308 achieved around 1800 FPS with 145-grain Wolf ammunition, a reasonable but not exceptional velocity for the caliber and barrel length. The reviewer notes the firearm is now functioning flawlessly but plans to sell it due to its impracticality, suggesting a PTR-9KT or a full-size .308 rifle as more practical alternatives.

Quick Summary

The PTR 51P PDW experienced reliability issues due to an incorrect 70-degree locking piece, designed for 9mm MP5s, being used in the .308 caliber. PTR Industries resolved this by replacing the upper receiver and hammer. Chronograph tests show the 8-inch barrel achieved 1800 FPS with 145-grain ammo, but the firearm is considered impractical for .308.

Chapters

  1. 00:07PTR 51P PDW Returns
  2. 00:17Diagnosing the Problem: Locking Piece Issue
  3. 00:30Locking Piece Angles and Calibers
  4. 00:47Identifying the Incorrect Locking Piece
  5. 01:12Impact of Incorrect Locking Piece
  6. 01:42PTR Industries' Resolution
  7. 02:06Current Configuration and Parts
  8. 02:12End Cap Assembly Details
  9. 02:28Reconfiguration Options
  10. 02:51Decision to Sell
  11. 03:01Function and Chronograph Testing
  12. 03:21Muzzle Brake and Shooting Feel
  13. 03:30Chronograph Results: .308 vs 300 Blackout
  14. 04:05Practicality and Use Cases
  15. 04:12Sling Configuration
  16. 04:44Overall Impression: A Cool Gun
  17. 04:49Future Firearm Considerations
  18. 05:09Questions and Ownership Experience
  19. 05:18PTR Customer Service Experience
  20. 05:27Final Thoughts and Farewell

Frequently Asked Questions

What caused the reliability issues with the PTR 51P PDW?

The primary cause of the PTR 51P PDW's reliability problems was an incorrect 70-degree locking piece, typically used in 9mm MP5s, being installed in the .308 caliber firearm. This led to premature unlocking and excessive stress on components like the buffer and hammer.

How did PTR Industries resolve the issues with the 51P PDW?

PTR Industries replaced the serialized upper receiver of the firearm and provided a new hammer. The original trigger pack was returned with the new hammer, bringing the PTR 51P PDW back to its factory configuration and resolving the previous malfunctions.

What are the chronograph results for the PTR 51P PDW?

With an 8-inch barrel and 145-grain Wolf ammunition, the PTR 51P PDW achieved approximately 1800 feet per second. This is a reasonable velocity for the caliber and barrel length but is considered suboptimal for full-house .308 loads.

Is the PTR 51P PDW considered a practical firearm?

The reviewer finds the PTR 51P PDW to be impractical for most uses due to its short barrel length and the inherent compromises in .308 performance. While it functions well and is fun to shoot, more practical alternatives like a PTR-9KT or a full-size .308 rifle are suggested.

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