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In 2014, Gemtech launched a line of user-serviceable suppressors that utilize their G-Core monocore baffle design and helped shape the market. Within this impressive group, the GMT-300BLK stood out as a true “gem.” Unlike some .30 caliber silencers, the GMT-300BLK is specifically engineered for the .300 Blackout round and offers shooters the coveted full-auto rated designation.

The innovative minds of the Gemtech operation are found in Boise, ID, where their cutting-edge designs become reality. With the unveiling of revolutionary units like the GMT-300BLK suppressor, Gemtech will continue to pioneer the silencer manufacturing industry for a long time to come.

Further Intel

This all-titanium can features Gemtech’s G-Core baffle setup, which aids in its overall performance and offers a minimum 28 dB sound reduction. The GMT-300BLK is a compact (6.7” long) and lightweight (14 ounces) suppressor that is optimized for use with both super- and subsonic ammunition in short-barreled rifles. This direct-thread silencer is as versatile as it is convenient. Being a user-serviceable unit, the GMT-300BLK is easy to disassemble for cleaning and general maintenance. With so many effective features, why not pull the trigger on your purchase and own one of these rock stars?

Rapid Fire

  • Full-auto rated!
  • Sound reduction: 28–30 dB
  • Weight: 14 ounces
  • Length: 6.7”
  • Build material: titanium
  • Finish: matte black Cerakote™ with reduced visual-IR signature
  • Easy to disassemble/clean

What’s In the Box?

  • Tan nylon utility pouch with closure
  • Target for shooting practice
  • Warranty card and user manual

What are the Critics Saying?


Specification Information

Caliber Rating .300 BLK
Thread Pitch 5/8x24
Color Black
Length 6.7"
Diameter 1.5"
Weight 13.9 oz
Manufacturer Gemtech
Build Material Titanium

5 Reviews For GEMTECH GMT-300BLK

  • Alpheus1/21/2017

    Good noise suppression. Unfortunately, similar issues. I started using Teflon tape on the cover threads. Used one layer first time and it disappeared after 40 rounds. I used a double layer of Teflon tape second time and ran 75 rounds of subsonic. I could remove the cover just using my hand. Also really need to clean the inside of the tube after shooting. I waited till third range trip and had to soak in CLP to finally remove the buildup inside the tube.

  • Pete11/23/2016

    I have put about 500 rounds thru the GMT-300 so far (mostly subsonic). Very effective sound reduction with subsonic. I agree with previous reviewers on the issue of clogged threads. I soaked overnight in Kroil oil the first time it locked up (effective but unreasonable to do every time). GemTech could have designed better!

    Talked with GemTech rep / recommends using a copper based anti-seize on the rear threads of the core/tube to make disassembly easier, as well as tightening the core to the barrel first, then putting the tube on over the core, which should keep from allowing the tube to get locked on to the core during tightening. I plan to try the anti-seize approach next.

  • HarryA11/14/2016

    While the GMT-300BLK is a pretty good suppressor, I'm a bit disappointed in the "pop" of the first round. Subsequent rounds are quieter. My greatest disappointment, however, is with the design of the screw-on cover. I've fought with it since I got this suppressor, and it's just getting worse. Now, in fact, I cannot remove the cover from the monocore assembly. I've used lubricants, vises, wrenches, impact drivers, etc., and still cannot budge the screw-on outer cover from the monocore. The depth of the socket receiver GemTech designed into the cover is laughably shallow; if the socket would fit into the front of the cover more than 1/8", you might be able to break the cover free using a breaker bar. I've contacted GemTech to inquire about the problem and have yet to receive a response.

  • Shooter4/30/2016

    Gemtech should update the socket insert for the owners at no cost. Not sure why they didn't design the insert to fully accept the depth of a socket. The end of the can just strips and ends up looking like shit. Get rid of the cute Gemtech trademark and engineer a solid and functional part.

  • Richard1/17/2016

    The GMT-300BLK is a well made suppressor, and does a very good job of silencing the round. That's as far as it goes. The internals foul very quickly. If you don't remove the outer cylinder every ten rounds or so, it is extremely difficult to remove, to the point that even a regular socket wrench won't do it. I must place the suppressor in a vise and use a cordless impact driver to get enough energy to break the can apart. When I do, the square drive opening in the end is so shallow that it begins to strip out. I have used various lubricants to try to make the job easier, with no success. So now I thoroughly tighten the monocore to the barrel using my socket wrench, then screw the cover on by hand, making sure not to tighten much at all. Even so, I loosen the cover every ten rounds and twist back and forth to break free any buildup. I think Gemtech could have done much better with their design

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The suppressor is optimized for use with both super and subsonic ammunition in short barreled rifles chambered for the 300Blk round only.

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