Investigations into the shooting death of actor Johann Ofner, who died while filming a hip-hop music clip in Brisbane will focus on how firearms came to be used on set.

The 28-year-old Ofner, who worked as a stuntman and an actor, was killed by gunfire yesterday afternoon while filming a video for ARIA award-winning band Bliss N Eso's new song, Friend Like You.

His death came just hours after he posted a video to Instragram showing off what he wrote were "faulty props" that the actors were to use on set.

The video shows three guns - including a sawn-off shotgun - along with money, gambling chips and a fake knife.

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Underground bar Brooklyn Standard was closed to the public last night while ballistics and crime scene investigators tried to work out what happened.

Detective Inspector Tom Armitt said the legality and use of "several firearms" would be an integral part of the investigation.

"Several firearms were discharged during the scene by several actors," he said.

"The man has received wounds to the chest, how they occurred that is part of our investigation."

Police are treating the freak death of the young man as a criminal matter, until proven otherwise.

- AAP