All wrong. In most cases silencers reduce min damage and on the SCARAB and Grendel reduce max damage also.
As for the SCARAB well.. its just a slightly weaker version of the SCAR that can use a silencer.. but if you are using a silencer why not just use the Feline?
The SCARAB isnt weaker to the point where you cant have a great game with it but honestly.. its not better than the SCAR.
Scar, Scarab, Feline are all good, but each have something thats their forte.
Scar is more Long/Med range
Feline is more Short/Med range
Scarab is mostly Med, but can do Long/Short well too. It fits my gameplay better than the Scar/Feline + i like the Silencer.
-fuzz