What does a suppressor help hide in addition to reducing sound?

A suppressor primarily serves to reduce the sound produced when a firearm is discharged, but it also plays a significant role in hiding the gunner's physical position. When the noise of gunfire is diminished, it becomes more challenging for adversaries to pinpoint where the shots are originating from, thereby offering a tactical advantage. This is especially crucial in combat situations where maintaining concealment can increase the safety and effectiveness of the gunner.

The other options do not align with the primary function of a suppressor. A suppressor does not influence the visibility of the type of ammunition used, the count of rounds fired, or provide any distinctive signals related to the machine gun model. These aspects remain apparent through various means, regardless of whether a suppressor is present, making the concealment of the gunner’s position the most relevant function related to the question.