Mythbusters actually confirmed that it was possible in an episode.
So you can shoot around corners according to Mythbastards - whoop the fucking doo!. Anyone else notice they talk about a 90 degree curved barrel gun but they never tell us what kind of curved ammo they use?
Agree with this, that looks like an attachement to an ordinary weapon, reckon if he fired it would probably just blow the attachement off. However firing around corners is possible but it normally involves holding a straight firing weapon around the corner which isnt very effective.