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Nope, it is not a "Can".
It doesn't decrease the noise level, only re-directs it forward.
It doesn't really trap the gas, it simply creates back pressure.The gas still escapes.The Krink isn't designed to "suppress" or quieten the report of an AR, it is to improve reliabilty of the short barrelled uppers.
If you look up the definition of a suppressor in the Criminal Code, it says nothing about "trapping" gas, only about being designed or intended to reduce/muffle/eliminate the report or a firearm.
I can tell you from first hand experience that the Krink in NO WAY supresses the sound of my AR.
SKBY.