Suppressors do not make guns completely quiet as the movies would lead you to believe. Suppressors are nothing more than a muffler like on a car. Coincidentally the same person who invented the first commercially viable suppressor, Hiram P. Maxim, is also credited with inventing the muffler for cars. The average drop in sound is 14 to 43dB and depends on several factors. This will help protect the hearing of the shooters as well as reduce noise pollution around shooting ranges.
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