Source: SSD and TacticalFanboy
The pistol and suppressor components of the VP9 were developed simultaneously to produce the most quiet 9mm pistol in the world. Capable of a reduction of 31.5 dB, the suppressor is designed so that even standard 124 gr. FMJ ammunition won’t reach supersonic speed, producing a noise level as low as 129 dB – roughly the same level of noise as a car door closing; use of subsonic ammunition further lowers the sound signature to around 125 dB. In fact, according to B&T, the shot is so quiet that manipulating the bolt-like-action to cycle another round is louder than the shot itself.
No word on when the VP9 will be available for purchase, however it was featured in the April 2014 issue of the B&T Partner Update, so expect further updates soon.