if you're using Milkshape 3d to model this (hopefully not) then you can use it's LOD feature while exporting to have two seperate models, one for third person with no hands and only fire animations, and another model mainly for first person thats fully animated and with hands. 100 LOD is for first person and 0 LOD is for third person, make sure you don't have any other numbers in there. This way, the model will look cooler in third person since it won't have floating hands. Just a small tip.