What I hope will not come to be is that the humvee carrying the gun will not become a prime target for insurgents with rpgs. The humvee will not be as manuverable as one that just contains three Marines lets say. It will be almost top heavy and not be able to move about to avoid incoming very well.
A humvee even if they doubled or tripled the thickness of the armor would not stop a rpg. But hopefully by the time a final version is put into service, Iraq will be a truly quite place for the most part. Guess time will tell.
Those are very good concerns. I'll bet they use a similar set up to the way they use the sound weapons.
Whatever that set up is! LOL!