A look inside the Gemtech GVAC Upper

Published on April 13, 2024
Duration: 8:56

This video provides an in-depth look at the Gemtech GVAC upper receiver, a system designed to mitigate over-gassing when using suppressors. It explains the bore evacuator concept, its application in the GVAC system, and details the specifications of the upper, including its barrel, BCG, and handguard. The review highlights the GVAC's effectiveness, particularly with low back pressure suppressors, and offers insights into its installation and performance.

Quick Summary

The Gemtech GVAC upper receiver utilizes a bore evacuator system, integrated into its gas block, to redirect gas flow out the muzzle. This design effectively mitigates over-gassing when using suppressors, particularly low back pressure models, by expelling gas forward rather than back into the action.

Chapters

  1. 00:00Introduction to Gemtech GVAC
  2. 00:24Suppressor Back Pressure Effects
  3. 01:04Tuning & Bore Evacuator Concept
  4. 01:30How Bore Evacuator Works
  5. 01:48Gemtech Ownership & New Suppressors
  6. 02:17GVAC System Functionality Explained
  7. 02:50Upper Receiver Specifications
  8. 03:16Barrel Specifications
  9. 03:30Bolt Carrier Group (BCG) Details
  10. 04:16Handguard Details
  11. 04:26Muzzle Device & Installation
  12. 05:21Field Testing Experience (Indoor)
  13. 05:45Field Testing Experience (Outdoor)
  14. 06:29Accuracy Testing Results
  15. 06:55Gas System Modifiability
  16. 08:04Handguard Compatibility & Conclusion

Frequently Asked Questions

What is the primary function of the Gemtech GVAC upper receiver?

The Gemtech GVAC upper receiver features a novel gas block design that acts as a bore evacuator. Its primary function is to redirect gas flow out the muzzle, away from the shooter's face, thereby mitigating over-gassing issues commonly experienced when using a suppressor.

How does the bore evacuator system in the Gemtech GVAC work?

The GVAC system integrates a bore evacuator, similar to those on tank cannons, into the AR-15 gas system. It acts as an expansion chamber, capturing gas from firing and then expelling it forward out the barrel once the projectile has exited, preventing gas blowback.

What type of suppressors are best suited for the Gemtech GVAC upper?

The Gemtech GVAC upper performs best in conjunction with low back pressure suppressors, such as the Gemtech Abyss and Neutron. While it offers some improvement with high back pressure suppressors, it is not ideally suited for them without further tuning.

What are the key technical specifications of the Gemtech GVAC upper?

The reviewed GVAC upper has a 16-inch mid-length barrel made from 4150 CRMOV steel with a nitride finish, 5R rifling, and a 1:8 twist. It includes a phosphate-coated, chrome-lined BCG with a Carpenter 158 bolt head and 'sand cuts'.

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