Originally Posted by
Kalise
Except...
The fact that they don't function in the same way at all?
It's like saying Machinists guns and Dark Knights weapons are the same because they're pieces of metal with a handle.
Gunbreaker (VIII) weapons are swords with a revolver handle, that uses cartridges not to fire a projectile, but to send a shock down the blade upon impact to increase the effectiveness of the strike.
Lightning (XIII) weapons are swords, that fold into guns to shoot bullets at people.
This isn't a case of "Just make it bigger", it's literally completely different designed weapons.
Paladin and Dragoon can get away with different types of weapons, because they still function the same way. Paladin bops people with a Sword/Axe/Mace, Dragoon stabs people with a Spear/Lance/Halberd/Partisan/Spontoon.
Theoretically they could give Gunbreaker a Blazefire Saber and just hand wave over the fact that there's no way it would function how GNB uses it... But it's unlikely that they would do so (Even ignoring the fact that they don't seem to want to go back to re-do event weapons for new jobs)