A man is accused of bringing an unlicensed gun to a Providence bar and becoming violent with police after being arrested.  Officers were called to the Vault Lounge early Sunday morning after Frank Rodriguez flashed a gun during an altercation.  Police allegedly found the loaded handgun underneath the driver's seat of a car.  While in custody, Rodriguez is also accused of attacking an officer.  He is facing several charges including resisting arrest, possession of a firearm and assault on a detention officer.