Most Awesome AR-15....That Nobody Will Buy..

Published on October 21, 2020
Duration: 21:54

The CMMG MK57 in 5.7x28mm offers impressive performance with low recoil and minimal muzzle rise due to its Radial Delayed Blowback system. While technically superior to many AR pistols, the high cost and limited availability of 5.7x28mm ammunition make it an impractical choice for most consumers. The review highlights build components, range testing, and a detailed look at the unique operating system.

Quick Summary

The CMMG MK57 Banshee in 5.7x28mm utilizes a Radial Delayed Blowback system for reduced recoil and muzzle rise. While technically impressive, the high cost and scarcity of 5.7x28mm ammunition make it an impractical purchase for most shooters.

Chapters

  1. 00:00Intro: CMMG MK57 & 5.7x28mm Benefits
  2. 01:30Lower Receiver & Trigger Setup
  3. 02:57Radial Delay Blowback Mechanics Explained
  4. 04:33Accessories & Holosun 510C Optic
  5. 06:00Barrel & Configuration Options
  6. 08:325.7x28mm vs 9mm vs .223 Ammo Comparison
  7. 09:52Range Testing & Troubleshooting
  8. 11:36Shooting Experience & Recoil Comparison
  9. 13:36The Fatal Flaw: Ammo Cost & Availability

Frequently Asked Questions

What makes the CMMG MK57's Radial Delayed Blowback system unique?

The Radial Delayed Blowback system keeps the bolt locked longer, allowing chamber pressure to drop significantly before cycling. This reduces felt recoil and muzzle rise compared to standard blowback systems, offering a smoother shooting experience.

What are the main advantages of the 5.7x28mm cartridge in an AR pistol?

The 5.7x28mm round offers high velocity with very low recoil and minimal muzzle blast, making it exceptionally controllable for rapid follow-up shots. It bridges the gap between pistol and rifle cartridges in terms of performance.

What issues were encountered during the range testing of the CMMG MK57?

Initial range testing revealed 'hammer follow' malfunctions, which were traced to loose set screws in the previously installed trigger. After replacing the trigger with a CMC flat single-stage unit, the firearm performed flawlessly.

Why is the CMMG MK57 considered a firearm 'nobody will buy' despite its technical merits?

The primary reason is the extremely high cost and limited availability of 5.7x28mm ammunition, often costing $1.00 to $2.00 per round. This economic factor makes it impractical for most shooters, despite the firearm's excellent performance.

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