On the very day that I earn enough reputation to get the Zombie Sweeper Shotgun from the Argent Crusade, Pierce's Pistol drops for me in Heroic CoS.
In case you didn't know, the two are identical in every way except how you get them, and how much you spend to get them. So I am truly blessed, or cursed, depending on your viewpoint.
In other news, we seem to have a real mental block WRT Heroic Azjol'Nerub. HCoS didn't offer any special issues other than learning the fights. HA-N is our undoing. We don't get past the first boss, usually. We're going to have to study that some.