Going through my bookmarks, and thought some of you might like these links.

Wikipedia List of firearms - General list of all the firearms. Below are the categorized links.
http://en.wikipedia.org/wiki/List_of_firearms

Wikipedia List of pistols
http://en.wikipedia.org/wiki/List_of_pistols

Wikipedia List of submachine guns
http://en.wikipedia.org/wiki/List_of_submachine_guns

Wikipedia List of assault rifles
http://en.wikipedia.org/wiki/List_of_assault_rifles

Wikipedia List of shotguns
http://en.wikipedia.org/wiki/List_of_shotguns

Wikipedia List of sniper rifles
http://en.wikipedia.org/wiki/List_of_sniper_rifles

Wikipedia List of aircraft weapons
http://en.wikipedia.org/wiki/List_of_aircraft_weapons

I don't know if a bigger list of firearms exists. If it does please feel free to post it for me Hope everyone enjoys.

Brad