What happens when you start at port before you do any maintenance and have no crew in the weapon slots. Purchace/place the gun as you with then go to the crew screen and see if the empty slots for the weapons have been created.
I never have crew in the weapon slots when I pull into port. When I need the weapons manned during patrol, I recruit them from DC or inactive bridge crew. I'm careful to keep a few gun-rated crew in the bridge and DC positions.
-Pv-
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