The Best 9mm Carbine of 2017 (CMMG Guard)

Published on November 14, 2017
Duration: 11:32

This review of the CMMG Guard 9mm carbine highlights its innovative Radial Delayed Blowback system, which significantly reduces felt recoil and improves reliability compared to traditional straight blowback designs. The firearm demonstrated excellent performance with various ammunition types and a low malfunction rate over extensive testing. While praised for its handling and potential for home defense, a key drawback is the 1/2x36 barrel threading, limiting immediate suppressor compatibility.

Quick Summary

The CMMG Guard 9mm carbine stands out with its Radial Delayed Blowback system, which uses a rotating bolt to delay action opening, reducing felt recoil and preventing malfunctions. Its lighter bolt carrier group (15 oz) further enhances shooting dynamics. With over 1500 rounds tested and only one malfunction, its reliability is high, though the 1/2x36 barrel threading limits common suppressor compatibility.

Chapters

  1. 00:35Introducing the CMMG Guard 9mm
  2. 01:39Design and Features Overview
  3. 01:59Radial Delayed Blowback System Explained
  4. 02:28Blowback System Comparison
  5. 03:42Reduced Reciprocating Mass Benefits
  6. 04:24.45 ACP to 9mm Conversion
  7. 04:45Ammunition and Barrel Twist Test
  8. 06:36Barrel Threading and Suppressor Issues
  9. 07:09Second Shooter Experience
  10. 09:27Field Testing and Reliability Results
  11. 10:28Future Improvements and Suppressor Test Plans

Frequently Asked Questions

What makes the CMMG Guard 9mm carbine's action system unique?

The CMMG Guard utilizes a Radial Delayed Blowback system. This design features a rotating bolt face that delays the opening of the action by forcing the bolt to rotate, which significantly reduces felt recoil and prevents common malfunctions like crushed casings.

How does the CMMG Guard's bolt carrier group weight compare to standard 9mm carbines?

The CMMG Guard's bolt carrier group and buffer weigh approximately 15 ounces. This is considerably lighter than a standard 9mm carbine's BCG and buffer, which typically weigh around 1 pound 3 ounces, contributing to reduced reciprocating mass and faster follow-up shots.

What is the reliability of the CMMG Guard 9mm after extensive testing?

The CMMG Guard 9mm variant underwent extensive field testing, with over 1500 rounds fired. During this testing, only one malfunction was recorded, which occurred with factory-loaded ammunition, demonstrating a high level of reliability.

What is the barrel threading on the CMMG Guard 9mm, and what are the implications for suppressor use?

The CMMG Guard 9mm features a 1/2x36 barrel threading. This is a key point as most 9mm suppressors are threaded 1/2x28. This incompatibility means users will need an adapter or a specific suppressor designed for 1/2x36 threading.

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