I'm not saying the new gun class is going to be... but its going to be...

[Aliquis]

It is possible that the Rapier would be Main hand weapon, and the gun would be tied to abilities, this way the gun is always there, but it would never change...so there is that obstacle. Unless it changed skin when equipping new rapiers.

This would be really neat!

Yes this is exactly how I see it. I had to cut a lot out because of the 2000 character limit. Originally i discussed Engineer and Ranger as well as more about the functionality of the class/job.

Edit: Oh but I see what you meant now. Liek the gun would never really change its always there. Like Scholars book in FFXI. But then that kind of leaves out the whole lore on the blacksmith guild pioneering gun craft.