A Supreme Court murder trial has heard a key witness saw a "black duffel bag" and "piles of guns" handed out at a home in Adelaide's northern suburbs before the fatal shooting of Jason De Ieso in 2012.
The unidentified witness told the court he was later handed a duffel bag and instructed "make sure you clean this and then destroy it, you don't know what we've just done".
Eight men are accused of murdering Mr De Ieso, who was gunned down at his Pooraka crash repairs workshop in what the court has heard was a case of mistaken identity amid escalating rivalry between the Hells Angels and Finks bikie gangs.
Brothers Husain, Mohamed and Musa Alzuain, and five others — Daniel Mark Jalleh, Ross William Montgomery, Seywan Moradi, Kyle Lloyd Pryde and Nicholas Sianis — are facing murder charges.
Thursday's witness appeared via video link to give evidence for a second day.
He told the court that, while getting burgers for lunch two days after the shooting, Musa Alzuain gave him a revolver.
The witness said that he was told: "Make sure you have this on you in case they come past and do what we did to them".
The court heard that, months later, police told the witness they believed that the firearm was used during the shooting that killed Mr De leso.
The witness said he asked Musa Alzuain if that was the case and was told in response: "It was possibly shot at somewhere around him but not at him."
"I got pretty angry and I'm pretty sure I swore at him [Musa Alzuain] and walked off," the witness told the court.
"I was pretty angry that a firearm that was used in a murder was given to me."
'Something was going to go down', court told
The witness told the court that, on the day of the shooting, he saw a "black duffel bag on the table", "heaps of pairs" of garden gloves, and firearms at a Salisbury house.
He told the court that alcohol was being consumed at the time and Hells Angels members were present.
"There was nothing unusual about drinking alcohol, but the atmosphere felt different, it didn't feel like a party," the witness told the court.
"Everybody seemed on edge, everybody seemed like they were getting hyped up, like something was going to go down."
The court heard there was a fight between the rival bikie groups at an Adelaide kickboxing tournament on November 17, 2012 — days before the fatal shooting.
The court heard that the Hells Angels members expected 10 to 15 Finks members to be attending the same event but, upon arrival, members were confronted with 60 to 70 Finks members and a fight between the two groups ensued.
Prosecutor Jim Pearce KC has previously told the court that a "cascading" series of events between the two rival bikie gangs led to the death of Jason De Ieso, who was not the intended "target".
Defence lawyers for Husain and Mohamed Alzuain have previously outlined their clients' defences.
Earlier this month, Winston Terracini KC, for Husain Alzuain, told the court his client's defence fundamentally was that he was "not there", "did not take part in the offence at all", "did not know the deceased man" and "did not assist".
"Just because you're a member of a bikie association doesn't mean that the next step is you're going to effectively gun somebody down," Mr Terracini said.
Grant Algie KC, for Mohammed Alzuain, said his client's defence would similarly involve questions about his whereabouts at the time of the shooting.
"Was Mohammed Alzuain one of those nine people at [the Pooraka workshop]?" Mr Algie said.
"That, I'm confident, is what it's going to come down to."
