ACCURACY Test CMMG .22LR Conversion Kit

Published on April 16, 2026
Duration: 18:57

This video provides an in-depth accuracy test of the CMMG .22LR conversion kit for AR-15 platforms, comparing its performance to standard 5.56/.223 ammunition. The instructor, with apparent experience in firearms testing, details the impact of rifle twist rates on .22LR accuracy and evaluates several .22LR ammunition types at 50 yards. The results indicate an average group size of approximately 2.5 inches, with CCI Standard Velocity performing best, highlighting the kit's suitability for plinking and training rather than precision shooting.

Quick Summary

The CMMG .22LR conversion kit transforms a 5.56 AR-15 for cheaper plinking and training. However, accuracy is impacted by the rifle's twist rate; a 1:8 twist barrel, common for 5.56, is less ideal for .22LR than the preferred 1:16. At 50 yards, expect average groups around 2.5 inches, with CCI Standard Velocity performing best.

Chapters

  1. 00:00Introduction & Test Setup
  2. 00:16Accuracy Test vs 5.56
  3. 00:22CMMG .22LR Conversion Kit Explained
  4. 01:16Rifle Twist Rates (1:7, 1:8, 1:9)
  5. 02:03.22LR vs 5.56 Twist Rate Differences
  6. 02:47Purpose of Conversion Kits
  7. 03:0650 Yard Accuracy Test Plan
  8. 03:165.56 Ammunition Choice (PMC XT M855)
  9. 05:12Firing 5.56 Groups
  10. 06:015.56 Zeroing & .22LR Prep
  11. 06:31Inserting .22LR Conversion
  12. 06:39.22LR Ammunition Order
  13. 07:04Armscor .22LR Performance
  14. 08:22Firing Armscor Group
  15. 08:46Armscor Group Results
  16. 09:17Firing Aguila Group (Dud)
  17. 09:34Aguila Group Results
  18. 09:40Firing Norma Tac-22 Group
  19. 10:06Norma Tac-22 Group Results
  20. 10:15Firing CCI Standard Velocity Group
  21. 10:39CCI Standard Velocity Results & Flyers
  22. 10:50Best Performers - CCI Standard Velocity
  23. 11:43Final CCI Standard Velocity Test
  24. 12:10Final CCI Group Analysis
  25. 12:30Overall .22LR Accuracy Summary
  26. 12:50Group Size Measurements (50 Yards)
  27. 14:12Review Video Accuracy Comparison
  28. 14:38Hitting Small Targets at Distance
  29. 15:08Intended Purpose: Training & Plinking
  30. 15:14Impact of 1:8 Twist Rate
  31. 15:25Potential Improvement with 1:9 Twist
  32. 15:331:12 Twist Barrels
  33. 15:50Ammunition Quality Matters
  34. 16:10Average Group Size Conclusion
  35. 16:40Visuals: 3-Inch Targets at 50 Yards
  36. 16:57Visuals: Half Scale Silhouette at 75 Yards
  37. 17:13Visuals: 6-Inch Target at 100 Yards
  38. 17:43Hitting Targets at Various Distances
  39. 18:026-Inch Target at 100 Yards Equivalence
  40. 18:09Not a Tack Driver, But Functional
  41. 18:28Conclusion & Call to Action

Frequently Asked Questions

What is the CMMG .22LR conversion kit used for?

The CMMG .22LR conversion kit allows you to convert a standard .223/5.56 AR-15 rifle into a .22 Long Rifle firearm. It's primarily used for cost-effective plinking, practice, and training due to the lower cost of .22LR ammunition compared to 5.56.

How does a rifle's twist rate affect .22LR accuracy with a conversion kit?

Rifle twist rates are critical. While .22LR typically performs best with a 1:16 twist, using a conversion kit in an AR-15 with a 1:8 or 1:7 twist (designed for heavier 5.56 bullets) can negatively impact .22LR accuracy, often resulting in larger group sizes.

What kind of accuracy can be expected from a CMMG .22LR conversion kit?

In this test, using a 1:8 twist barrel at 50 yards, the CMMG .22LR conversion kit averaged group sizes of about 2.5 inches. While not precision-level, this is considered acceptable for plinking and engaging targets up to 100 yards.

Which .22LR ammunition performed best with the CMMG conversion kit?

CCI Standard Velocity .22LR ammunition showed the best performance in this accuracy test. While other brands like Armscor, Aguila, and Norma Tac-22 were tested, CCI Standard Velocity provided the tightest groups, especially in its initial shots.

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