Is it possible in real life? I'd imagine so, as they could very well make silencers designed for the buckshot, but of course not every piece of the shock (name for shotgun ammo/bullets) will get through the silencer, thus demoting its power and/or range.
SIR, Did u steal this idea from my thread, lol but,
http://www.youtube.com/watch?v=8j5P0LXemAA