The 34-year-old Caboolture man is being treated in hospital for minor injuries he suffered when police opened fire on him with "bean bag" bullets in Brisbane Queen St Mall on Friday.
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The siege, which led to the evacuation of thousands of people from the busy landmark, lasted for about 90 minutes.
The man has been charged with five counts of serious assault on police and one count each of going armed so as to cause fear, and to carrying an exposed weapon in a public place.
The heavily tattooed man, who had taped the gun to his right hand, at one stage held the weapon to his throat to keep police at bay.
The father of three was to face Caboolture Magistrates Court next week on several charges over a bizarre self-harm incident.
The Ethical Standards Command is investigating how police handled the incident.
He is to face Brisbane Magistrates Court on March 15.
