LWRC IC MKII 12.7” Upper: 30-Shot Groups

Published on April 9, 2026
Duration: 4:51

This video provides a detailed performance review of the LWRC IC MKII 12.7-inch upper receiver. It includes extensive 30-shot group testing with three different ammunition types at 100 yards, presenting detailed ballistics data such as average velocity, standard deviation, and extreme spread. The review also touches on the upper's technical specifications and internal condition, offering insights into its accuracy potential with various loads.

Quick Summary

The LWRC IC MKII 12.7-inch upper receiver features a mono-forged upper, ambidextrous charging handle, and a 12.7-inch black nitride cold hammer forged barrel with a 1:7 twist. Testing with Federal 77gr SMK yielded 2.771 MOA, Hornady 73gr ELD Match produced 2.703 MOA, and PMC 62gr M855 resulted in 4.133 MOA over 30-shot groups at 100 yards.

Chapters

  1. 00:00Introduction to LWRC IC MKII 12.7" Upper
  2. 00:06Technical Specifications Overview
  3. 00:14Barrel Details: Black Nitride, Cold Hammer Forged
  4. 00:24Barrel Condition: Round Count & Throat Erosion
  5. 00:38Chamber and Throat Inspection
  6. 01:04Rifling and Gas Port Examination
  7. 01:16Shooting Setup and Methodology
  8. 01:18Test 1: Federal Gold Medal 77gr SMK
  9. 01:55Federal Load Ballistics and Group Analysis
  10. 02:08Federal Load 30-Shot Group Size & AZ Score
  11. 02:24Federal Load 10-Shot Group Breakdown
  12. 02:30Federal Load Performance Ranking
  13. 02:43Test 2: Hornady 73gr ELD Match
  14. 02:55Lower Receiver Setup: AR Gold Trigger, A5 Buffer
  15. 03:14Hornady Load Ballistics and Group Analysis
  16. 03:26Hornady Load 30-Shot Group Size & AZ Score
  17. 03:32Hornady Load 10-Shot Group Breakdown
  18. 03:38Hornady Load Performance Ranking
  19. 03:41Test 3: PMC X-TAC 62gr M855
  20. 03:53Ammo Variety and Barrel Performance
  21. 04:09PMC Load Reliability and Malfunctions
  22. 04:14PMC Load Ballistics and Group Analysis
  23. 04:22PMC Load 30-Shot Group Size & AZ Score
  24. 04:31PMC Load 10-Shot Group Breakdown
  25. 04:37PMC Load Performance Ranking
  26. 04:41Conclusion and YouTube Member Content

Frequently Asked Questions

What are the key technical specifications of the LWRC IC MKII 12.7-inch upper receiver?

The LWRC IC MKII 12.7-inch upper features a mono-forged receiver, ambidextrous charging handle, LWRCI Skirmish sights, a short stroke gas piston system, and a 12.7-inch black nitride cold hammer forged barrel with spiral fluting. It has a 5.56 NATO chamber, 1:7 twist rate, and an A2 flash hider.

How did the LWRC IC MKII 12.7" upper perform with different ammunition types in 30-shot groups?

With Federal Gold Medal 77gr SMK, it achieved 2.771 MOA. Hornady 73gr ELD Match yielded 2.703 MOA. PMC X-TAC 62gr M855 resulted in 4.133 MOA. These results indicate varying performance depending on the ammunition used.

What is the significance of the throat erosion reading on the LWRC IC MKII barrel?

A throat erosion reading of 1 on a gauge indicates a very low round count for the barrel. This suggests the barrel is relatively new and has significant remaining service life, contributing to its potential accuracy.

What methodology was used to test the accuracy of the LWRC IC MKII upper receiver?

The reviewer conducted 30-shot group tests at 100 yards, believing this provides more reliable data than 5-shot groups and allows for barrel heat analysis. A Shooter's Bubble SG pulse accelerometer was used to monitor shot control.

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