Shooting a 7.75" long-stroke piston AR15 | PWS Mk107 Mod 2 "Diablo"

Published on May 20, 2020
Duration: 6:53

This video reviews the PWS Mk107 Mod 2 'Diablo', a 7.75-inch barreled AR-15 utilizing a long-stroke gas piston system similar to an AK-47. The reviewer highlights its compact nature, the PWS proprietary buffer system, and an aftermarket LMT two-stage trigger. Initial reliability issues, including stovepipes and double feeds, were observed, potentially linked to insufficient gas adjustment, which the reviewer later addresses by adjusting the gas block on the fly.

Quick Summary

The PWS Mk107 Mod 2 'Diablo' is a compact AR-15 with a 7.75-inch barrel and a long-stroke gas piston system. Chambered in .223 Wylde, it fires both .223 Remington and 5.56 NATO. It features an adjustable gas block, PWS buffer system, and an aftermarket LMT safety selector with a two-stage trigger, though initial reliability issues were noted and addressed by gas adjustment.

Chapters

  1. 00:00Introduction to the PWS Mk107 Diablo
  2. 00:26Barrel Length and Caliber
  3. 00:36Optics and Sights
  4. 00:48First Shots and Initial Impressions
  5. 01:31Recoil and Shooting Feel
  6. 01:48Malfunction: Stovepipe
  7. 02:00Malfunction: Double Feed
  8. 02:21Initial Reliability Assessment
  9. 02:31Testing with Standard PMAG
  10. 03:02Testing with Steel Cased Ammunition
  11. 03:14Malfunction: Stovepipe with Steel
  12. 03:35Malfunction: Double Feed with Steel
  13. 03:53Continuing Reliability Testing
  14. 04:00Controls Walkthrough
  15. 04:02Magazine Release and Well
  16. 04:14Safety Selector and Trigger
  17. 04:30PWS Buffer System
  18. 04:38Firearm Heating Up
  19. 04:48Adjustable Gas System
  20. 05:15Adjusting Gas System on the Fly
  21. 05:45Post-Gas Adjustment Firing
  22. 05:54Cycling Improvement
  23. 06:10Confirmation of Gas System Effectiveness
  24. 06:17Final Thoughts and Recommendations
  25. 06:27Upcoming Video Teaser

Frequently Asked Questions

What is the PWS Mk107 Mod 2 'Diablo'?

The PWS Mk107 Mod 2 'Diablo' is a compact AR-15 rifle featuring a 7.75-inch barrel and a long-stroke gas piston system, similar to AK-47 designs. It is chambered in .223 Wylde, capable of firing both .223 Remington and 5.56 NATO ammunition.

What are the key features of the PWS Mk107 Mod 2?

Key features include its short 7.75-inch barrel, long-stroke piston operation, .223 Wylde chambering, PWS proprietary buffer system, an adjustable gas block for tuning, and an aftermarket LMT safety selector with a two-stage trigger.

What kind of reliability issues were observed with the PWS Mk107 Mod 2?

During initial testing, the PWS Mk107 Mod 2 experienced stovepipe malfunctions and double feeds. These issues were potentially linked to insufficient gas pressure, which the reviewer addressed by adjusting the gas block.

How is the gas system adjusted on the PWS Mk107 Mod 2?

The PWS Mk107 Mod 2 features an adjustable gas block that can be tuned on the fly, even using the tip of a bullet. This allows users to optimize gas port pressure for different ammunition types and shooting conditions.

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