The player model isn't scaled and its not even in the right position. Dafuq.
These are just to be used as references. Like say someone wanted to make an Uzi, and they want it to be in the same style as the default Gun. They can download that pack, edit the gun to their liking and use it as a base file, then they can scale it if they need to. Same thing for the Blockhead model. Someone can start with that, make some edits to it - say they're making a mutant or something - then scale it to the right size.