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

Published on October 21, 2020
Duration: 21:54

This review details the CMMG MK57 AR-15 platform chambered in 5.7x28mm, highlighting its innovative Radial Delay Blowback system. The host, Mr. GunsnGear, an experienced firearm builder, explains how this system reduces recoil and muzzle rise. Despite the technical advantages and smooth operation, the review concludes that the high cost and limited availability of 5.7x28mm ammunition make this otherwise impressive firearm a difficult purchase for most consumers.

Quick Summary

The CMMG MK57 AR-15 in 5.7x28mm features an innovative Radial Delay Blowback system for reduced recoil and muzzle rise. While technically impressive and easy to shoot, its high ammunition cost and limited availability are significant drawbacks, making it a niche purchase.

Chapters

  1. 00:00Introduction to CMMG MK57
  2. 01:30Lower Receiver and Trigger Setup
  3. 02:57Radial Delay Blowback Mechanics
  4. 04:33Accessories and Optics
  5. 06:00Barrel and Configuration Options
  6. 08:32Ammunition Comparison
  7. 09:52Range Testing and Troubleshooting
  8. 11:36Shooting Experience
  9. 13:36The Fatal Flaw: Cost and Availability

Frequently Asked Questions

What is the CMMG MK57's operating system?

The CMMG MK57 utilizes a proprietary Radial Delay Blowback operating system. This system uses a spring-pressured bolt that stays locked for a few milliseconds longer than standard blowback, allowing pressure to drop before cycling, which significantly reduces recoil and muzzle rise.

What are the advantages of the 5.7x28mm cartridge in an AR-15 platform?

The 5.7x28mm cartridge offers high velocity comparable to some rifle rounds but with significantly lower recoil and concussive blast than 5.56x45mm NATO. It provides a unique balance, making the firearm exceptionally easy to control during rapid fire.

What are the main drawbacks of the CMMG MK57?

The primary drawbacks identified are the high cost and limited availability of 5.7x28mm ammunition. While the firearm's performance and technology are impressive, the economics of the caliber make it a difficult purchase for many shooters.

What barrel lengths are available for the CMMG MK57 upper?

The CMMG MK57 upper is available in three barrel lengths: 5-inch, 8-inch (as shown in the video), and 16-inch. This variety allows for customization based on user preference and legal considerations.

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