The first commercially-viable shotgun suppressor is the SilencerCo Salvo 12. The Adaptable Salvo 12 fits almost every shotgun, from pump actions and semi-autos to inertia driven models. Sections can be moved to balance sound suppression, weight, and length needs. In addition to a decrease in felt recoil, at its full length of 12 inches, the Salvo 12 brings the sound down to 136.8 dB at the muzzle.