The South Australian Government says it will consider legislative changes to help tackle the number of shootings in the state.
The Opposition has accused the Government of failing to keep the public safe, in light of 16 shootings in South Australia this year.
Opposition frontbencher Stephen Wade says focus needs to be on stopping the flow of illegal firearms.
"The fact of the matter is that police need to be freed up to focus on crime, rather than being used by this Government as a tax-raising team through speed camera revenues," he said.
But Mr O'Brien has accused the Opposition of watering down multiple pieces of legislation aimed at tackling gun crime in the upper house of State Parliament.
"We've found on a whole raft of legislation over the last couple of years that we get it through the lower house because we've got a majority there and then it gets into the upper house and it's absolutely picked to pieces," he said.
He says he will discuss the crime concerns with Mr Rau in coming days.
"[We will discuss] fresh legislation or a tightening up of the existing legislation, but that's really very much firmly within his domain," he said.
Mr O'Brien has conceded recent shootings created a community risk, but says most had involved people known to each other.
The minister says SA Police Commissioner Gary Burns has indicated he has all the resources and powers needed to deal with such incidents.
At the weekend, a motorcyclist was shot seven times, at the intersection of Main North and Midway Roads at Elizabeth North in Adelaide's northern suburbs.
The man, 31, who was riding a stolen bike, is in a stable condition in the Royal Adelaide Hospital, as police continue to hunt for his attackers.