What is motivating this suggestion?
Heavy frigate is pretty underpowered right now, and there isn't much point taking it over the interceptor since it is a big target and slow and easily breacheable
What is your proposal?
give it a second gun, like in its description but for balance it has to be the default rust bucket canon, so the capital frigate still has its place
Exactly and specifically, what should be changed and how?
add secondary rust bucket canon, so the heavy frigate sees more use in raids. Most players in space combat don't have the capital frigate, so this gives groups more options to play with and makes the space part of a raid a bit more engaging.
The price in crafting of the heavy frigate can be increased to make up for this buff