Tried the above. The game starts with 0 unknown shells (when you try out the flak gun, it says No Ammunition, I don't know what ammo it is talking about since no bullet icon is highlighted), but when you switch to ordinary Flakzwiling AP bullets, the thing functions as a normal AP bullet flak

.
Any suggestions?
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BTW, hacked 8k impulse, 8k range, 40 knot, 179 degree turn rate Zaunkonig II is killer.