Ok, so I was looking thru the MSHs in the common folder when I happened upon a MSH called "com_weap_broken_gunturret". I assumed it to be a broken version of the standard gun turret that could be used instead of the square buildzone. I put it up in zeroeditor to take a peak and was a bit surprised by what I found. I later found another similar MSH called "com_weap_gunturret_hulk". Here's a screen:
The one in the back is the "hulk" and the one in the front is the "broken gunturret". I found these kinda neat but they are both "damaged" versions of the MSH and I can't find a MSH for a fuctioning gunturret like these.

i think i saw a traler with those in it

Probably one of the many unused assets from bf1. The turret version may have gotten lost.

Yah, these would have been the original gun turrets as the MSH for the new has some comments about it being "version_2" when I open it in Hex-edit. I was thinking is it'd be cool if someone with moddeling experence could use these MSHs to recreate the working turret.

spent roughly 10-20 mins on thsi its not my top priority.
you need to tweak odfs i made em in a rush
http://www.gamefront.com/files/20000604/turret.zip

Awesome, great work bamdur