Hello,
When using the Grendal with a silencer, if you switch the firing mode to single shot, the sound of your shots are no longer suppressed.
You still don't show up on the radar to other players, but they can hear your gun fire as if you did not have a silencer attachment on it.
FYI.

this has already been reported in the known issues/bug reporting thread stickied at the top of this forum.

Cool was not sure, but thanks for pointing that out.