If any one still plays dark forces I suggest you use this site
It is regurlarly updated and has an active forum:
http://www.df-21.net/
It also has a healthy supply of maps to keep you going for a while!
The map I would suggest to dl if you just like to shoot the crap out of stuff is the map The Danger Room!
http://df-21.net/downloads/missions/dangroom.zip
I love Dark forces!!!