Gun "Silencers" Don't Make Them Anywhere Near Silent

“Silencers”, also known as “suppressors”, on guns don’t make them anywhere near silent. Silencers primarily only suppress the noise due to the pressure wave from the rapidly expanding propellant gases. This is only a portion of what makes a gunshot loud. The primary other source of noise in a gunshot is the sonic crack created by the bullet (for bullets that exceed the sound barrier, which is a large majority, unless they are modified to specifically be subsonic).

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