Well, I lack the skill to do this, too.Though, I seem to recall someone made a mod that made the blasters sound like modern guns. They didn't make any models, but they were able to take out the "Blaster fire" so it looked right for the sound.
Just search pcgamemods. I forget the name of the mod at the moment, sorry. I know its not exactly what you're looking for, but you might still like it.
If someone does decide to do it, I have a sujestion.
What about a AK-47 for HK-47? hahe
EDIT:
I found the mod I was talking about.
http://www.pcgamemods.com/mod/10879.html)
It might suffice while you await replies.