Badass American picks up his M107 with a huge suppressor and fires it from the shoulder to show the difference between subsonic and supersonic ammunition!

Subsonic ammunition is ammunition designed to operate at speeds below the speed of sound, which at standard conditions is 343.2 m/s. This avoids the supersonic shockwave or “crack” of a supersonic bullet, which, particularly for suppressed firearms, influences the loudness of the shot.

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