Papercraft is an evolved form of the ancient art of Japanese origami. While with origami, no glue is used, you are free to use glue and other means of holding the paper or card stock together with papercraft.
Paper Wars is an English art exhibit that features some very well done papercraft weapons. Among the classic cold-war type weapons, they have designed an AK-47, Mills Bomb, MP5, Oerlikon 35mm, and an Uzi. Counterstrike fans should know some of those guns well.
Yes, they were originally in black and white. Hey, its for dramatic effect.