Are you game for picking up a couple books?
My faves are:
Small Arms, Artillery and Special Weapons of the Third Reich by Gander
Outstanding reference on weapons used by the German Army in WWII. Produced by two renowned experts this provides to all small arms, anti-aircraft guns, light and heavy artillery, including rail guns and armoured trains, mortars ,rockets, mines etc. etc. all well illustrated and described. 371pp., numerous illustration
The Encyclopedia of Infantry Weapons of World War II by Hogg
A fully comprehensive and illustrated reference work including every major type of weapon used by every army in the world during the Second World War. Every infantry weapond used during World War II, including rifles, machine guns, anti-tank weapons, mortars and grenades are cited on a country by country basis.
Both feature a variety of nations but mainly major countries.
Check abebooks.com (descriptions from abe)