Caliphate

Caliphate is the Stand of Mask. It is a handgun that never runs out of ammunition.

Base Stats
Mask can be hired for 30,000G after convincing Hol Horse and heading back to Cairo after discovering Dio's Manor. His tactic is "Keep Your Distance" and he joins the party at level 40.

Moveset
Despite the description for 'Open Fire' being the same as for 'Rapid-Fire', the former hits all enemies while the latter doesn't.

Caliphate essentially has the same moveset as Emperor with the exception of Homing Shot.