It's a real shame no one makes any fanart of the manga. Some really neat scenes are in there that really enhance the series beyond that one action scene in the Anime with the P90 that everyone always draws or references to.
One of my favorites scenes was where Petra uses her spectre to slice a target in half. I tried to do it a couple years back when I had access to machine guns but it actually is pretty hard to do in one magazine (Beta mag). You have to have really good control to not let the muzzle dip or rise, and to sweep in a very constant rate otherwise a little chunk of paper will hold the target together.