A suppressor adds weight therefore it must reduce recoil. Also, the high pressure gases are trapped momentarily by a suppressor which cause the felt recoil to be spread out across a longer period of time as the trapped gases are dissipated. Suppressors have a beneficial impact on felt recoil although not as much as a well designed muzzle brake.I know a muzzle brake will reduce recoil (at the expense of making more noise), but I've never heard that a suppressor will affect recoil. Is that true?