CMMG Mk57 Banshee 5.7x28 AR-15 Pistol: Ultimate PDW or Truck Gun?

Published on July 24, 2018
Duration: 19:35

The CMMG Mk57 Banshee in 5.7x28mm is a lightweight PDW offering impressive accuracy, with Federal American Eagle 40gr FMJ achieving a 0.5-inch group at 50 yards. Its Radial Delayed Blowback system significantly reduces recoil. Suppressed shooting with subsonic ammo requires a lighter buffer for reliable cycling. The pistol accepts FN Five-seveN magazines and has an MSRP of $1500.

Quick Summary

The CMMG Mk57 Banshee in 5.7x28mm offers impressive accuracy, achieving a 0.5-inch group at 50 yards with Federal American Eagle 40gr FMJ. Its Radial Delayed Blowback system reduces recoil, and suppressed subsonic shooting requires a lighter buffer for reliable cycling.

Chapters

  1. 00:30Introduction to the CMMG Mk57 Banshee
  2. 02:08Accuracy Testing at 50 Yards
  3. 06:06Muzzle, Barrel, and Handguard Specs
  4. 07:41Suppressed Performance
  5. 08:52Radial Delayed Blowback System Explained
  6. 12:03Receiver and Controls
  7. 15:09Furniture and Final Assessment

Frequently Asked Questions

What is the accuracy potential of the CMMG Mk57 Banshee in 5.7x28mm?

During testing at 50 yards with a Steiner P4Xi scope, the CMMG Mk57 Banshee demonstrated excellent accuracy. The Federal American Eagle 40gr FMJ load achieved a tight 0.5-inch group, highlighting the pistol's precision potential.

How does CMMG's Radial Delayed Blowback system work?

CMMG's Radial Delayed Blowback system utilizes the rotation of the bolt to delay its opening. This mechanical advantage significantly reduces felt recoil and makes the firearm quieter, especially when paired with a suppressor.

What modifications are needed for suppressed shooting with subsonic 5.7x28mm ammo?

When using subsonic 5.7x28mm ammunition with a suppressor, it's necessary to swap to a lighter buffer. CMMG provides a specific lighter buffer designed to ensure reliable cycling of the action under these conditions.

What is the MSRP and weight of the CMMG Mk57 Banshee?

The CMMG Mk57 Banshee has a Manufacturer's Suggested Retail Price (MSRP) of $1500. It is also notably lightweight, weighing in at 4 pounds and 7 ounces, making it highly portable.

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