It's not a real suppressor. None of the sound suppressors you see in movies or TV shows are real; typically, armorers just make suppressor cans from aluminum cylinders (or whatever else is available). It means that they have fewer NFA-regulated items to worry about on-set, and there's also a reason (I forget what exactly) that using a real suppressor in combination with blank ammunition is actually dangerous.
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Cry "Havoc," and let slip the hogs of war.
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