Manufacturer: Gemtech Silencers
GEMTECH's GMT-300BLK suppressor utilizes our patented G-Core technology. 300Blackout is a unique round that super and subsonic ammunition function differently in the same rifle. The suppressor is optimized for use with both super and subsonic ammunition in short barrelled rifles. The GMT-300BLK, being a G-Core suppressor, is completely user serviceable.
  • Sound Reduction: 28-30 dB
  • Caliber: 300 Blackout Supersonic and subsonic only
  • Full Auto Rated
  • Length: 6.7"
  • Diameter: 1.5"
  • Weight: 14 oz.
  • Material: Titanium
  • Tube Finish: Black Cerakote with Reduced Visual-IR Signature
  • Core Finish: Titanium
  • Mount: 5/8-24 Thread


Overall great can. One must consider the purpose before buying though. If you are looking for the quietest gun on the market, look elsewhere. There are more quiet options. I recommend looking into the Dead Air Sandman, Griffin Recce, or Silencerco Omega. That being said, if you are looking for a business can, that will go to hell and back, and not impede upon ones ability, this is your can. This can is insanely light. This is a fighting can, it is well within the hearing safe realm, and will allow one to keep their hearing inside structures, with no ear pro, and still hear the floor squeak afterwards. Combined with the insanely light weight, this is one of the best fighting cans I have seen/held/shot. I am happy I made the purchase, as this is on my go to gun for home defense. Very easy to clean as well. Unlike other users, my can has never seized up on any gun. There is no need to crank this thing down as if there is no tomorrow. Twist it on until it stops rotating, and give it a light tug. After hundreds of rounds, it comes off easily.
The GMT-300BLK does an excellent job of sound suppression. I like the monocore idea, and the suppressor is sturdy and well-built. The good part of my review ends there. 300BLK is a dirty round, and this suppressor gunks up very quickly in between the monocore and the outer shell, so much so that it is extremely difficult to take apart if one allows it to get dirty at all. Moreover, the 3/8" drive socket, advertised as a good means to separate core from case, is too shallow for a socket wrench to gain purchase, and will strip out easily. My first experience with the GMT-300 resulted in my having to use that 3/8" drive, with the suppressor in a vise and using a cordless impact driver, to get the suppressor apart. That was after50rounds. There was no way gentle persuasion was going to work. The drive socket was boogered up, so I sent it back to Gemtech and they sent it back with a new core. Now I use the drive socket to firmly attach the core to my barrel, then screw on the outer case, making sure I don't' tighten too much. Then EVERY TEN ROUNDS I loosen the outer shell and rotate it back and forth several times to knock down the buildup between shell and core, and repeat the process the whole time I shoot. Pain in the neck, and not a practical way to use a suppressor, but unless you want to live with a  suppressor that's' designed to be user serviceable and  turns into what might as well be a welded can, this procedure is necessary. This suppressor gets three stars only because it  does the job of suppression well. From a user perspective, I consider it an engineering failure, and I would recommend avoiding it. There are better solutions out there. I regret buying it
Modern Rifleman
Gemtech socket insert isn’t deep enough for heavy use. It works but they should have cut it deeper. I’m contacting them to see if they will fix my silencer so it is more useable.  The end of the can just strips out.

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