Job Name: Gunslinger
Weapons: Dual Guns/Combined Rifle

Similar to Viper its weapons combine into single rifle, similar to the character Sazh from FF13. It will in a sense be a ranged Viper, specializing in abilities and weapon skills that have more of an aoe focus while in duel wield mode, and when in Rifle mode will focus more on single target abilities and skills.

A Cartridge mechanic similar to Gunbreaker with the Combo actions helping to build up the gauge, along with a similar mechanic to Bard's Coda to help improve the damage of a burst GCD ability

Could bring back and adapt the old MCH mechanics involving ammunition from Pre-Shadowbringers, with each bullet granting special effects to the character like a mini summoner egi mechanic and could even include some of the old abilities as well such as:

Reload
Quick Reload
Grenado Shot
Lead Shot
Gauss Barrel

Have Rapid Fire as a built-in trait

Add a Dodge Roll Ability for a Dash

Add a Quick Load Ability to instantly fill gauge

This could potentially free up MCH, to become more of an "inventor" role, and free it up from the expectations of having gun-based abilities and skills, and maybe make it a bit more technical like pictomancer.