I feel like a pioneer!  As for the ingame sounds; I'm not sure.  Check out 
http://chaosfilms.dodhq.net/news.php  in the tutorials section.  
The bi-pod was just a custom model I got from a site.  It's kinda cool.  It took me a while too make the movie.  I had to record demos then change them to BSP which sucked up harddrive space.  Just read the tutorials on that site.