Oleg,
Reflex reportedly makes one and AWC Turbodyne has one. They're supposed to make less blast for the spotter.
Here's what is written about the Reflex
"The well known recoil-action Barrett M82 with model BT8 Telescopic Reflex Suppressor is almost comfortable to shoot, regarding the suppressing effect on noise and the absence of pressure shock on shooter and spotter. Current suppressor model has an integral muzzle brake (not shown in the cut-away drawing of an earlier model) to boost the recoil brake effect. Because a suppressor adds the mass of the recoil action barrel of the M82, some shooters use a stiff spiral spring seen in the photo above between the suppressor and the receiver to further soften the felt recoil."
The Barrett M82 is not uncomfortable to shoot without a suppressor - but I have heard of complaints from people standing in back and to the side of the shooter.