Yes and no
The 30cal and the Magnum were ported including their animations. But...they have bugged melee animations. The creator just used the Webley Melee animation for the Magnum. Problem is, that it doesn't fit, not even a little. It's easy to get that weapons ported into CoD2 since Treyarch left the xanim_export and model_export files in their modtools. There are one or two more weapons they left in source state, one of them is the flamethrower I think.
The Double Barrel Shotgun + the sawed one are in the CoD2 Western Mod. But with self created animations which are really, how do I say this, I'll put this nicely and say the look...different.(No offense to whoever created those animations, but they just don't look as good as the one from Treyarch). As a pro, they have a melee animation.
Other weapons are modern weapons from CoD4 with normal CoD2 animations. The Raygun and the Wunderwaffe with not fitting CoD2 animations as well.
Or have you seen any other weapons around?