11.5" of Pretty Good - Griffin Armament MK1 11.5" .223 Wylde

Published on September 9, 2023
Duration: 26:26

This review of the Griffin Armament MK1 11.5" .223 Wylde upper receiver highlights its premium features like a 416R stainless steel HEDP barrel with 5R rifling and a robust SNATCH charging handle. While offering good accuracy potential and a rigid, low-profile handguard, the review notes trade-offs in barrel life, gas system optimization for suppressed use, and a less robust handguard lockup compared to some competitors in its price bracket. The BCG is functional but shows significant wear after extensive testing.

Quick Summary

The Griffin Armament MK1 11.5" .223 Wylde upper receiver features a 416R stainless steel HEDP barrel with 5R rifling for accuracy, a rigid Low Pro Rigid handguard, and a SNATCH charging handle. While offering good unsuppressed performance, its gas system is over-gassed when suppressed, and the handguard lockup is considered mediocre compared to competitors.

Chapters

  1. 00:48Introduction to Griffin Armament MK1 Upper
  2. 01:56HEDP Barrel System Deep Dive
  3. 03:03Gas System and Gas Block Analysis
  4. 07:53Bolt Carrier Group (BCG) Examination
  5. 09:27Low Pro Rigid Handguard Features
  6. 13:26SNATCH Charging Handle Review
  7. 15:18Flash Hider & Suppressor Mount System
  8. 19:07Reliability and Shootability Assessment
  9. 20:42Accuracy Testing and Performance
  10. 23:42Value and Comparison to Competitors
  11. 24:44Overall Conclusion and Recommendation

Frequently Asked Questions

What are the key features of the Griffin Armament MK1 11.5" upper receiver's barrel?

The MK1 features an 11.5-inch High Endurance Dual Purpose (HEDP) barrel made of 416R stainless steel with a 1:8 twist and 5R rifling. It has an M4A1 SOCOM profile, a black nitride finish, and polished M4 feed ramps, aiming for enhanced accuracy.

How does the gas system on the Griffin Armament MK1 perform, especially with a suppressor?

The MK1 has a carbine-length gas system with a port size around 0.072-0.073 inches. While it shoots softly unsuppressed, it tends to be over-gassed when suppressed, ejecting rounds at 1-2 o'clock even with an H3 buffer.

What are the pros and cons of the Griffin Armament MK1's handguard and lockup?

The Low Pro Rigid handguard is lightweight and rigid due to internal reinforcements. However, its lockup mechanism, relying on four bolts clamping onto the barrel nut without anti-rotation, is considered mediocre and less robust than some competitors.

What is the expected barrel life of the Griffin Armament MK1's 416R stainless steel barrel?

The 416R stainless steel barrel is known for good accuracy but has a reduced barrel life compared to 4140 or 4150 steel. It's expected to offer about half the lifespan of those materials, even with a quality nitride coating.

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