Wonderfully Different Primary Weapon Systems Mk111 Pro Piston AR Pistol

Published on July 2, 2020
Duration: 6:03

This review of the Primary Weapon Systems Mk111 Pro piston AR pistol highlights its "wonderfully different" design. Key takeaways include the benefits of a piston system for cleaner and cooler operation, the unique pistol storage device (legally distinct from a brace/stock), and its controllable recoil impulse despite the short barrel. The adjustable gas block is noted, though not tested with suppressors in this review.

Quick Summary

The Primary Weapon Systems Mk111 Pro is a piston-driven AR pistol offering cleaner operation and reduced heat buildup compared to direct impingement systems. It features a unique, ATF-recognized pistol storage device and exhibits controllable recoil despite its short 11-inch barrel.

Chapters

  1. 00:01Introduction: PWS Mk111 Pro
  2. 00:05Piston Driven AR Design
  3. 00:18AR History: DI vs. Piston
  4. 00:30Piston System Manufacturers
  5. 00:36Mk111 Pro Barrel Length & Piston
  6. 00:46Benefits of Piston ARs
  7. 01:00Previous Comparisons: Heat & Cleanliness
  8. 01:14Traditional AR Comparison
  9. 01:23AR Pistol Recoil Handling
  10. 01:37Controllability Demonstration
  11. 02:04Pistol Storage Device
  12. 02:11Legal Status of Storage Device
  13. 02:33Storage Device Utility
  14. 02:37Tia's Shooting Impression
  15. 03:00What Makes it Different?
  16. 03:38Recoil Observation
  17. 04:04Tia's Detailed Feedback
  18. 04:28Heat Management
  19. 04:51Summary of Differences
  20. 04:53Piston System Size & Balance
  21. 05:06Coolness & Cleanliness Benefits
  22. 05:24PWS's Piston Design
  23. 05:34Suppressed Fire Considerations
  24. 05:41Adjustable Gas Block
  25. 05:49Conclusion: PWS Mk111 Pro

Frequently Asked Questions

What are the main advantages of a piston-driven AR pistol like the PWS Mk111 Pro?

Piston-driven ARs, such as the PWS Mk111 Pro, stay significantly cleaner and cooler than traditional direct impingement systems. This is because the gas from firing is directed away from the receiver, preventing fouling and heat buildup where the shooter's hand is typically located.

What is the unique pistol storage device on the PWS Mk111 Pro, and what are its benefits?

The PWS Mk111 Pro features a pistol storage device that is legally recognized by the ATF as a storage accessory, not a brace or stock. This distinction offers a potential advantage against future regulatory changes affecting braces, and it also provides a convenient place to store a spare magazine.

How does the PWS Mk111 Pro handle recoil, especially with its short barrel?

Despite its 11-inch barrel, the PWS Mk111 Pro is noted for its controllable recoil impulse. Reviewers describe it as "pretty darn smooth" and manageable, not causing the firearm to excessively jump or fly out of the shooter's hands.

Does the piston system on the Mk111 Pro affect the firearm's balance?

Yes, the piston system on the Mk111 Pro can add some front weight, which shifts the firearm's balance. This can make it feel slightly front-heavy, potentially impacting the perceived weight when transitioning between targets or coming up on aim.

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