Reposting this, not sure you saw it.
SFMA2016 offline:
I was checking the 2 flak towers in the City Industrial Center.
1. The north flak tower has 4 auto flak guns (gna) and they can be destroyed with the destroy objects option in arena set up. (they appear normal)
2. The south flak tower has 4 armored auto guns (gna) and 11 hard auto guns (gnh) which I could destroy in arena set up, but the 12th hard auto guns is labeled as a train object (trn000). When I attempted to destroy the (trn000) gun in the arena set up, I got booted to desktop and the game closed. I believe it's the same type of flak tower you fixed at the fuel refinery that had the same problem. I tried several times to use the destroy objects option in arena set up to kill the (trn000) gun and was booted every time with the game closing also.
3. I found no other abnormalities with all of the other flak towers.