The following guns will be used in the Xbox 360, PlayStation 3 and PC versions of the video game Call of Duty: World at War (Wii version should be the same)
The M1 Carbine is rarely seen earlier in the American campaign, it is not used up until the Castle level, where it can be picked up from most of the american corpses
The M1918A2 In singleplayer is never seen without a bipod, but it must be unlocked in multiplayer. In Singleplayer, you start with it in the Level Relentless.
Winchester M1897
Unlocked Immediately in Multiplayer, In singleplayer it is Sullivan's Primary weapon, and is seemingly passed on to Roebuck after his death. For some particular reason, if you search through cleared out underground bunkers, they are just lying around.
A Mobile Machinegun, you first use it in 'Relentless' with a bipod. Later on in Singleplayer it is seen without a bipod. It has a cloth wrapped around the barrel close to the frame, a makeshift handguard. In the level 'Black Cats' dual-mounted on the bow and single mounted on the stern. In Multiplayer it is the last machinegun unlocked.
A technical Error about the grenade launcher in game, the M7 was the only one in service, that is correct, but the M7 is not capable of firing while the launcher is attached. It is first used when you take it off of a dead body when assaulting the Triple 25 guns. They are scattered all over the place when you are defending it.
Imperial Japanese Army
Type 99 rifle
Type 100 Submachine gun
Type 99 Light Machine Gun
Nambu Type 14 Pistol
First seen given to you by Sullivan, whether or not you replace it with a new weapon, it appears in your possession again after you are hit by a Anti-Infantry round, as you are being dragged by Sullivan to the escape boat, but you do not get much of a chance to use it.
Type 97 hand grenade
Type 92 Heavy machine gun
Type 95 NCO Army Gunto
Not Usable in game, it makes various appearances however, and is used to kill Sullivan.
Type 30 Bayonet
Red Army
Mosin Nagant
The Mosin-Nagant is the first rifle given to you by Reznov, due to his lack of trigger finger [but for some reason firing a PPSh is fine], it is fitted with a scope. Right away you are not given ammo. In later levels they are in the hands of Russian Soldiers. For an unknown reason, they are more rare than PPSh SMGs.
SVT-40
PPSh-41
The PPSh is first seen in the hands of Reznov, after he gives you the Mosin-Nagant. Which for some reason he can't fire due to his lack of a right trigger finger, but he can fire the PPSh just fine.
Degtyaryov
Double-barreled shotgun
It first makes its first appearance in the Asylum, found in the kitchen, sawed off and with a grip. Later in the Subway, it is seen normally, and are lying around in all of the offices.
PTRS-41
The Large Anti-Tank rifle is always seen with a scope [essentially CoD5's Barrett], but is first seen in single player during 'Vendetta'. Much later in Downfall, one can be found on the second or third level, my mind is fuzzy on the specifics.
Tokarev TT-33
Used to execute German Prisoners, as well as your standard sidearm until you replace it.
RGD-33 hand grenade
Molotov Cocktail
Wehrmacht
Karabiner 98k
Gewehr 43
MP40
STG-44
FG42
Walther P38
Used by a German Soldier to shoot Private Petrenko just as he is attempting to plant the flag.
Model 24 Stielhandgranate
Panzerschreck
MG42
United Kingdom
Though there are not any british troops in the Xbox 360, PS3, Wii and PC versions, the english sticky bomb is able in the game.