I have been working for over a year to create the quietest rifle I can, to help That Guy eradicate the hog problem on his deer lease. Although it doesn't offer a high rate of fire, it is certainly very, very quiet.
CVA Scout in .300AAC Blackout, YHM Phantom 7.62 Stainless QD Suppressor, Bowers Griptastic Suppressor Cover and the final piece...Gemtech 187gr Subsonic Ammo.
Judge for yourself...