After lots of testing, editing the rifle, I made a pair of hands to go on the rifle, I exported the entire model on the rifle.md3, after doing this I can see the arms in 3rd person.
After exporting the arms just for the hands.md3 I cant see it in 3rd person but in first person I get a blob of meshes, with no texture, and it fits half the screen up making it hard to see.
Any ideas how to make this work correctly?