I believe the Assassin perk is broken and not functioning with the Whisper-Quiet Muzzler. Damage does not increase when I install this mod on weapons to get them down into the range of 2.5m or less.
If it is working as designed, the follow up question would be what is the point of the perk then? I've gone through stores, my storage and inventory and only could find one weapon type, the saber, that starts with a default below 2.5m. That weapon's listed damage actually did go up when I bought the perk.
So, either the interaction with the mod is broken, a display bug isn't showing the