No it is not.
The weapon system uses a different rig, and animations of what the player can do are in the gamecore/guns folder.
Inside each gun folder is a gunspec.txt file. But to change the animation of the gun and arms, you will need to rig one in a model program and them animate it. Then you will have to change the gunspec.txt file to match your new model.
the gun mesh is called hud.x
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