It has bruce willis in it and if I remember right he is a mobster and his dad is the leader I think and the end of the movie he runs around the room and shoots everyone that's in the mob.please help thank you

Sounds like it could be Billy Bathgate (1991) - IMDb (http://www.imdb.com/title/tt0101453/) although it isn't Bruce Willis who is the son.

Last Man Standing? Of course, what movie doesn't Bruce Willis shoot everyone?