I tried all the guns on the battleship and they seem to work fine. (The starboard forward single 20 mm seems to rotate aft much less than its port companion, but maybe that is prototypical).
I had problems offline with the .time command. From daytime, setting .time 20 0 0 gave night. Then setting .time 9 0 0 gave sun reflected off the ocean, but no sun and no blue sky, i.e. it still looked like a weird version of night. Trying several other time values that should be daytime, like 15 0 0 didn't bring the sun back. Doing .time 8 0 0 then brought normal daylight back. Then .time 9 0 0 gave normal daylight instead of the weird night time it had before. In other words the time command seems to get stuck in improper modes and sometimes doesn't give deterministic results. Ndisles, external view, battleship.
