CMMG Mk57 5.7x28mm AR 15 Review

Published on July 25, 2018
Duration: 18:44

The CMMG Mk57 offers a unique AR-15 platform in 5.7x28mm, providing a balance between 9mm and 5.56 performance with reduced recoil. Its Radial Delayed Blowback system enhances shooting comfort. While 9mm remains a cheaper, more available option, the 5.7x28mm caliber boasts superior ballistic performance, lighter weight, and armor-piercing potential.

Quick Summary

The CMMG Mk57 is an AR-15 rifle chambered in 5.7x28mm, featuring CMMG's Radial Delayed Blowback system for reduced recoil. It offers better ballistic performance and lighter weight than 9mm, with potential armor-piercing capabilities.

Chapters

  1. 00:00Introduction to 5.7x28mm
  2. 01:35CMMG Mk57 Overview
  3. 02:45Caliber Comparison (5.7 vs 9mm vs 5.56)
  4. 04:31Technical Specifications
  5. 07:11Radial Delayed Blowback System Explained
  6. 11:17Ammunition and Magazine Testing
  7. 13:17Pros and Cons vs 9mm

Frequently Asked Questions

What is the CMMG Mk57 and what caliber does it use?

The CMMG Mk57 is an AR-15 platform rifle chambered in the 5.7x28mm caliber. It is designed to offer a unique shooting experience with characteristics falling between 9mm and 5.56x45mm.

How does the CMMG Mk57's Radial Delayed Blowback system work?

CMMG's patented Radial Delayed Blowback system utilizes gas pressure to delay the bolt's unlocking. This allows for a lighter bolt carrier group and results in a softer shooting experience compared to traditional blowback actions.

What are the advantages of the 5.7x28mm caliber over 9mm?

Compared to 9mm, the 5.7x28mm caliber offers significantly less recoil, a lighter projectile weight, better ballistic performance at range, and the potential to defeat certain types of body armor.

What are the key technical specifications of the CMMG Mk57?

The CMMG Mk57 features a 7075-T6 aluminum receiver, a 7-inch M-LOK handguard, and an 8-inch 4140 chrome-moly barrel. It is designed to accept standard FN or ProMag 5.7x28mm magazines.

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