The CMMG MK 47 Mutant Rifle

Published on September 2, 2018
Duration: 31:10

This video provides an in-depth review of the CMMG MK 47 Mutant rifle, focusing on its unique design for the 7.62x39mm cartridge. The presenter, an experienced firearms instructor, highlights the rifle's proprietary components, including a robust bolt carrier group and receiver, designed for AK-47 type magazines. The review covers extensive magazine compatibility testing, barrel accuracy, and the effectiveness of the muzzle brake, offering practical insights for potential buyers.

Quick Summary

The CMMG MK 47 Mutant rifle is a significant advancement for the 7.62x39mm cartridge in an AR platform. It addresses historical reliability issues by using AK-47 type magazines, which are shaped for the cartridge's taper, and features a robust, purpose-built bolt carrier group based on a .308 design for enhanced strength.

Chapters

  1. 00:05Introduction & Back Brace Disclaimer
  2. 00:31Introducing the CMMG MK 47 Mutant
  3. 00:46AK-47 Magazine Compatibility
  4. 01:10Tested Magazines Overview
  5. 02:16Key to Reliability: The Magazine
  6. 02:32Bolt Design for 7.62x39mm
  7. 03:11Proprietary Design Aspects
  8. 03:35Magazine Feed Column Explanation
  9. 05:28Historical 7.62x39mm AR Attempts
  10. 06:19CMMG's Solution: Original AK Magazine
  11. 06:39No Bolt Catch with AK Magazines
  12. 07:01Bolt Carrier Group Analysis
  13. 08:03Bolt Carrier Comparison (5.56, MK47, .308)
  14. 09:23Colt Defense EK-901 Comparison
  15. 10:25Commercial Components: Pros & Cons
  16. 10:52Receiver and Stock Assembly
  17. 11:09Lower Receiver Details
  18. 11:51Trigger Group and Hammer Springs
  19. 12:27Magazine Catch Mechanism
  20. 12:41Magazine Well Reliability
  21. 13:21Magpul PMAG Performance
  22. 14:17Bolt Carrier and Charging Handle
  23. 14:36Charging Handle Ergonomics
  24. 15:19Receiver Machining Quality
  25. 15:24Direct Cast / Internal Piston System
  26. 16:13Absence of Forward Assist
  27. 16:53Barrel Length and Gas System
  28. 17:20KeyMod Rail System
  29. 17:37AK-74 Style Muzzle Brake
  30. 18:16Optic Choice: Sig Sauer
  31. 18:36Barrel Plating and Accuracy
  32. 18:57Disassembly Process
  33. 19:13No Bolt Catch Explanation
  34. 19:24Overall Weight
  35. 19:30Side Charging Handle Suggestion
  36. 19:54Accessory Compatibility
  37. 20:12Ammunition Tested: Wolf & Hornady
  38. 20:23Accuracy Observations
  39. 20:47Range Test Introduction
  40. 20:52Summary of CMMG Mutant's Advancement
  41. 21:15Magazine Compatibility Test Setup
  42. 21:32Testing Israeli Ultimag Magazine
  43. 22:42Testing Chinese Commercial Magazine
  44. 24:14Testing Polish Polymer Magazine
  45. 25:51Testing East German Magazine
  46. 26:25Muzzle Brake Performance & Flash
  47. 27:20Testing Soviet 40-round AK Magazine
  48. 28:33Overall Enhancement of the MK 47
  49. 29:25Parts Compatibility Considerations
  50. 29:56Magazine Recommendations
  51. 30:17Ammunition Performance Summary
  52. 30:38Final Verdict: Excellent Rifle Option
  53. 30:52Contacting CMMG & Video Conclusion

Frequently Asked Questions

What makes the CMMG MK 47 Mutant unique for the 7.62x39mm caliber?

The CMMG MK 47 Mutant is unique because it's designed from the ground up to reliably function with the 7.62x39mm cartridge, primarily by utilizing AK-47 type magazines and featuring a stronger, purpose-built bolt carrier group and receiver, addressing common issues found in converted AR-15 platforms.

How does the CMMG MK 47 handle AK-47 magazines compared to other AR-15 conversions?

Unlike many AR-15 conversions that struggle with feeding the tapered 7.62x39mm round, the MK 47 is engineered to accept standard AK-47 magazines, which are shaped to accommodate the cartridge's taper. This results in significantly improved feeding reliability across a wide variety of AK magazines.

What are the key internal differences in the CMMG MK 47's bolt and receiver?

The MK 47 features a proprietary bolt carrier group and receiver. The bolt is based on a modified .308/7.62 NATO bolt, providing greater strength and support for the 7.62x39mm cartridge compared to standard 5.56 bolts that are often modified and weakened.

What is the operating system of the CMMG MK 47 Mutant?

The CMMG MK 47 Mutant utilizes an internal piston system. This means the gas operates a piston located within the bolt carrier assembly, which the presenter argues is a more accurate description than direct impingement for this rifle's gas system.

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