is the 127mm confrimed? be interesting to see what gun ends up on them. I suspect at present it'll be recovered 4.5's to keep supply chain simple and save cost.
An early design, shown in CGI and a model, had a 4.5'', but all the later designs have used the Italian 127mm - including the one with what looks like a badly scaled 76mm (wrong model purchased from TurboSquid?).
The thing is that sticking with the 4.5'' only saves money in the short term - i.e. it eases cashflow. Given that the 4.5'' shell seems to be in a developmental dead-end, it is *highly* likely that, over the lifetime of the ships, the 127mm, and it's guided shells, would be adopted. Fitting them up-front would probably be cheaper, but it may come down to cashflow on the day.
RP1