Can't speak about the WE M4 since mine haven't arrived yet, but what i've learned from my AW338 is that the performance of suppressor largely depends on which one you use and his relative position on the inner barrel.
Initially i had a small suppressor mounted in a way that the end of the inner barrel was at the tip ( entrance ) of the suppressor and i found that the sound was not only still there it was actually making the sound worse/louder.
But then i fabricated a new adapter so that i could use standard AEG suppressors and, since it attached a bit further back in the outer barrel th
