Commonwealth Aircraft Corporation CA-27 Sabre Mk.32 - "The Hunter Down Under"

true but Australia is in the air tech tree now and was put there under the commonwealth name

I mean, the Commonwealth hasn’t been officially called a sub either, and neither should it be since it is HUGE and way too big to be a sub that fits in the UK TT.

true but what can we do but wait and see

Are you certain it is a “filler” or counter weight and not just a cover?
Various aircraft fly with a cover over the cannon port to increase aerodynamic efficiency until the cannons are used.
The first round fired simply clears the cover on those.