Mum Laura, 31, from Malvern, Worcs., fumed: "I was absolutely horrified when I heard what had happened.
"I looked at the photo my mum took and I could see that Connor seemed very uncomfortable with what was happening to him.
"The cowboy was holding his head to one side and pressing the cocked pistol against his temple, it was sinister.
"Connor was shook-up. He was being restrained by someone he didn’t know. "In this day and age, it is not acceptable.
"Who knows who this man could be, he's just allowed to stand there with an imitation gun and no-one cares because he's painted gold.
"Connor already has enough problems with his ADHD, we're getting him tested for the autistic spectrum soon.
"But this has set him way back, it's not good for him.
"He's OK enough now, but he was really shaken up on the day and has since suffered flashbacks. I think these people need to be licenced before they are allowed out there.
"I mean they are just allowed to stand there and go near children."My God! It’s an outrage! There should be a law against it! WON’T SOMEONE THINK OF THE CHILDREN!!!
Birmingham City Council said the street entertainer would be warned about his conduct.
A spokesman said: "There is currently no legislation restricting ‘human statues’, unless they are causing an obstruction, a noise nuisance or any other public order offence.
"However, our city centre management team will be speaking to the performer in question about this allegation."Good luck with that job, then…