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1) First round pop -- This sounds self-explanatory, and perhaps it should be, but what exactly is it? First round ever through the suppressor? First round after cleaning? Is there ever a "second first round?"
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The first round fired is somewhat louder than the next rounds. The quieter later rounds is due to there being less oxygen in the silencer chambers after the first round is fired. There is another "first round" after enough time has passed for the air in the can to reach equilibrium with the outside atmosphere.
There are adapters available for most all common handgun threadings to 1/2x28.