CMMG MK57 5.7x28mm Banshee

Published on July 24, 2018
Duration: 15:55

This video reviews the CMMG Mk57 Banshee pistol and SBR variants chambered in 5.7x28mm. It highlights the firearm's AR familiarity, delayed blowback system with a skeletonized bolt for reduced recoil, and ambidextrous controls. The review includes extensive testing of various ammunition types, including subsonic and specialized rounds, against targets like bowling pins, avocados, melons, and ballistic gel, demonstrating the 5.7x28mm cartridge's performance characteristics.

Quick Summary

The CMMG Mk57 Banshee is available in 5-inch and 8-inch barrel variants, both with a 1:9 twist rate. It features CMMG's radial delayed blowback system with a skeletonized bolt for reduced recoil. The firearm is ambidextrous and weighs under five pounds with a 20-round magazine.

Chapters

  1. 01:10Introducing the CMMG Mk57 Banshee
  2. 01:38Mk57 Variants and Features
  3. 01:59Internal Mechanics: Radial Delayed Blowback
  4. 02:24What Makes 5.7x28mm Special?
  5. 03:545.7x28mm vs. Other Calibers
  6. 04:09Subsonic Ammo Test with Empty Buffer
  7. 06:12Test Drive: Elite Ammo Penetrator
  8. 06:40Bowling Pin Test: Elite Ammo
  9. 07:23Bowling Pin Test: Vanguard Ammunition
  10. 08:295.7x28mm Penetration Capabilities
  11. 08:38Testing Softer Targets: All Copper Hollow Points
  12. 08:56Soggy Avocado Test
  13. 09:57Melon Test with Hollow Points
  14. 10:41Ballistic Medium Test
  15. 11:32Magazine Test: FN 20-rounders
  16. 11:45Range Test: Banshee Mk57 Suppressed with Subs
  17. 13:33Marksmanship and Point of Impact Shift
  18. 14:30Can Handling and Heat
  19. 14:43Final Thoughts and Purchase Decision

Frequently Asked Questions

What are the barrel length options for the CMMG Mk57 Banshee?

The CMMG Mk57 Banshee is offered in two barrel length variants: a 5-inch barrel and an 8-inch barrel. Both configurations feature a 1:9 twist rate, suitable for stabilizing the 5.7x28mm cartridge.

How does the CMMG Mk57 reduce recoil?

The Mk57 utilizes CMMG's radial delayed blowback system. The bolt carrier group has been skeletonized to significantly reduce reciprocating mass, which the presenter claims brings the gun's recoil impulse to near zero.

What kind of ammunition was tested against bowling pins?

The video tested Elite Ammo 'Penetrator' rounds, which feature a tungsten coating, and Vanguard ammunition, described as an 'unobtainium alloy.' While they hit the pins, neither consistently penetrated through them in the test.

How did the 5.7x28mm perform against softer targets like a melon?

When using all-copper hollow point ammunition designed to fragment, the 5.7x28mm round performed exceptionally well against a melon. It effectively pureed the inside of the melon, creating a consistency described as melted ice cream.

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