I have a Mask V2 set dropped into a nicely shimmed gearbox, feeding an MP5 SD6. The thing is quiet as hell (relative to a regular AEG).
AOE and a decent spring guide really help to clean up the noise a gearbox makes, just by keeping the piston as straight-in-line as possible. A suppressor changes the noise made by the piston head from a "clack" to a "thump", and then the gun will sound differently when loaded vs. dry firing.
It's all about trying to mitigate "errps" and "thwaps", as opposed to overall sound reduction, because lower frequency sounds are harder for the brain to pinpoint.
Edit: We're talking about fractions of a second of reaction time difference here so, YMMV.
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