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.