[quote]Fourth, weapons and armor improve while you play the game. Weapons have their own talent trees with specific upgrades. Halfway through a fire fight you may suddenly start blasting nasties away with a fully automatic shotgun. Who knows?[/quote] This is slightly misleading. Only [b]Exotic[/b] weapons are shown to have specific upgrades so far. Speculation is that non-Exotic weapons have general weapon upgrades. For more in-depth: http://www.bungie.net/en-us/Forum/Post?id=61087992