Yes. Open the hands file, then hit "A" To select the entire model. Then go to file-->Export-->3DStudio(.3ds)... Choose desktop (or anywhere else you'll be able to find it) and hit the export button. YOU NEED TO HAVE THE ENTIRE MODEL SELECTED BEFORE EXPORTING OR THIS WILL NOT WORK. Then, open the .blend with your model in it, then click File-->Import-->3DStudio(.3ds)..., and select your file. Then hit OK. This will bring the hands into your pre-made model.
Hope this helped.
It did, But whenever i go to import it and i click import, a box shows up:
Import 3Ds...
< Size Constraint 10.0 >
Image search (This is selected)
Transform fix (Not selected)
When i click ok with this nothing happenes.
Edit: I figured it out.. THe hands are tiny and were inside my weapon.