A lot of people have been asking gun related questions lately. Here's the straight dope on all the weapons. THIS IS PC INFORMATION. Not sure how it translates onto other platforms.

Link: http://denkirson.xanga.com/738334226/brink/

I'd like to thank Den for his work through the years extracting information from game files for all of us. If you've never heard of him, he also has this forum site:

http://denkirson.proboards.com/index.cgi

A lot of solid info on other games as well. Hope this helps the community. Cheers!