Normally a bead blasted blue finish will be a dead flat black.
Just look at the top rib and sights of a revolver or the top of the slide on many autos.
These areas are finely bead blasted to give a non-reflective surface.
A heavy bead blasted blue looks like the Remington Express shotguns.
So, depending on how they do it, the gun is going to be a flat black.
The reason for giving your revolver a bead blast finish is likely because removal of the pits would require so much metal to be polished off it would leave major defects like dished out areas, rounded off edges, and irregular surfaces like lumpy looking areas like on the barrel.
In order to "remove" pits the all metal has to be reduced down to the bottom of the pit.
If it's not too badly pitted a Master polisher can work wonders, but when the pits are large and deep so much metal has to be removed the gun will look bad.