I swear i saw two different skins...
In the NS screenshots I saw on my NS screensaver (thanks, by the way. It scared the poop out of my roomates when Tiny popped on the screen while they were playing Resident Evil
) I noticed that there were two different Sentry Turret skins. One looked like a big nasty cannon on a low-set tripod, and the other looked like a rather inaccurate yet deadly chaingun. So... umm... is there a difference in how they perform in the game? And what do they each do?