That's a shotgun "silencer." It doesn't really silence the shot, but amplifies it in a way that makes it difficult to tell where the sound came from. You'll typically see these in outdoors environments where the enemy could be in any direction.
In dense jungle environments, the "silencer" may be omitted if a sawed-off style shotgun used. The short barrel of a sawed-off keeps the weapon's form factor small and avoids snagging the barrel on flora.
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