1st Look: CMMG 5.7 Upper & Trijicon SRO

Published on March 4, 2020
Duration: 10:01

This video provides a first look at the CMMG 5.7 Upper Receiver, notable for its use of standard AR-pattern magazines, allowing it to be mounted on any standard AR lower receiver. The review highlights its compatibility with 5.7x28mm ammunition and pairs it with a Trijicon SRO optic on a Scalarworks Leap mount. The presenter attempts the Bear Solutions Cold Start drill, discusses the firearm's performance, and later tests it suppressed with a Q Erector silencer, noting its pleasant shooting characteristics and potential for new shooters.

Quick Summary

The CMMG 5.7 Upper Receiver stands out by using standard AR-pattern magazines, enabling it to be fitted onto any AR lower. This review pairs it with a Trijicon SRO optic on a Scalarworks Leap mount, showcasing its modularity and performance, especially when suppressed.

Chapters

  1. 00:10Introduction
  2. 00:19Shot Show 2020 & CMMG 5.7
  3. 00:35CMMG's 5.7 Direction
  4. 01:07AR-Pattern Mags for 5.7
  5. 01:29Upper on SBR Lower
  6. 01:48Upper Receiver Components
  7. 02:01Barrel Length Discussion
  8. 02:20Trijicon SRO & Scalarworks Mount
  9. 02:48Bear Solutions Cold Start Drill Attempt
  10. 03:09Drill Details & Un-zeroed Optic
  11. 03:44Drill Execution
  12. 04:06Drill Mistakes & Time
  13. 04:50Zeroing the Optic
  14. 05:01Steel Shooting
  15. 06:44Fun Factor
  16. 06:52Shooting Suppressed
  17. 07:01Q Erector Suppressor
  18. 07:11Shooting with Suppressor
  19. 08:37Suppressed Performance
  20. 08:45Overall Impression
  21. 08:50PCC Modularity
  22. 09:03Magazine Capacity & Recoil
  23. 09:15Potential Use Cases
  24. 09:36Future Reviews
  25. 09:46Conclusion

Frequently Asked Questions

What makes the CMMG 5.7 Upper Receiver unique compared to other pistol-caliber carbines?

The CMMG 5.7 Upper is distinctive because it uses standard AR-pattern magazines, allowing it to be mounted on any standard AR lower receiver. This contrasts with many pistol-caliber carbines that require proprietary lowers or specific pistol magazines.

What optic was used with the CMMG 5.7 Upper, and what mount was it on?

The CMMG 5.7 Upper was paired with a Trijicon SRO red dot sight, which was mounted on a Scalarworks Leap mount. The SRO is noted for its larger window compared to the RMR.

What is the barrel length of the CMMG 5.7 Upper featured in the video?

The specific CMMG 5.7 Upper Receiver shown in the video has an 8-inch barrel. The presenter suggests this length is likely optimal for achieving good performance with the 5.7x28mm ammunition.

How does the CMMG 5.7 Upper perform when shot suppressed?

When suppressed with a Q Erector silencer, the CMMG 5.7 Upper is described as very quiet, to the point of being 'too quiet to register.' The shooting experience is noted as pleasant and enjoyable.

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