Action Airsoft has released another nice standard 14mm CCW silencer for KSC MP9/TP9, this time it comes with the QD flash hider. AEG/GBB silencers do not actually reduce the amount of noise emitted by the exhaustive system or gears interactions, but adding realism to your rifles. Although these silencers are only delivering cometic effect, they can be used to conceal longer inner barrels.
Silencers come in a broad variety of styles, this one is having "M4-5.56" and "AER.# A-SI-103" printed on. If your weapon does not have CCW threading then you can always look into getting an adapter.