The ex-army reservist, who cannot be named for legal reasons, gunned down senior Rebels bikie Nick Martin at Perth Motorplex on December 12, 2020 in a sniper-style attack.
The convicted murderer returned to the witness box on Friday at the trial of David James Pye, 43, who allegedly paid the killer $100,000 for the hit at the racetrack.
Pye's barrister, David Hallowes SC, attacked the 39-year-old's honesty during his cross-examination as he took him through recorded conversations and statements from before and after the killing.
One of those included a message the sniper sent a former teacher a month before he killed Martin about the 2014 siege in Iraq when Islamist extremists trapped thousands of Yazidi refugees on Mount Sinjar.
The trained marksman said he had been to Mount Sinjar and the Australian Federal Police interviewed him in April 2021 about it.
"They were speaking to you about foreign incursion or terrorism offences?" the lawyer said.
"Yes," the former artillery gunner said.
"That was something you were concerned about," Mr Hallowes said.
"Absolutely," the former part-time soldier said.
The shooter agreed he told a friend the federal police had questioned him over four counts of terrorism.
He also confirmed he used fake media credentials, suggesting that he worked for a news service and was attached to National Geographic magazine.
Mr Hallowes questioned the killer about being in Syria, which he strenuously denied, despite the lawyer showing him various emails and conversations, including a deployment document, stating he was.
In a police statement read to the court, the shooter admitted he told Pye he was in Syria during the country's civil war, but said he had been lying to impress the bikie.
"I spoke to (Pye) on occasions about me having killed people overseas and being in Syria," said one of the gunman's statements to police, read out by Mr Hallowes.Â
"I made this up."
The ex-soldier said he travelled to many places, including Iraq, where he was at times armed.
He also confirmed he viewed Martin's murder as "community service".
"It was probably my state of mind, yes," the shooter said when questioned about it.
"I wouldn't say I'm proud of what I've done."
Mr Hallowes accused the sniper of informing on Pye for a discounted sentence after he was charged with murder.
"Your state of mind at this stage was that if you wanted a discount, a significant discount, you needed to come to the party and put David Pye in, do you agree with that?" Mr Hallowes said
"I agree," the former part-time soldier said.
He also agreed he initially attempted to mislead police about his involvement in the killing.
"Did you say you were trying to do a deal whereby ... the police accept you're not the shooter and putting Pye in, saying he was involved?" Mr Hallowes said.
"Yes," the shooter said.
"You're happy to try and get a false account of what had taken place on a deal, if it suited your purpose, weren't you?" Mr Hallowes said.
"It would have suited me better, yes," the former soldier replied.
The shooter used a .308-calibre rifle to target Martin from a distance of more than 300 metres while the bikie was sitting in a spectator area at the racetrack.
The bullet travelled through Martin's body and exited from his lower back before striking another man in his arm, seriously injuring him.
Pye has pleaded not guilty to six charges, including murder.
The ex-soldier was sentenced to 20 years' jail in 2021 after pleading guilty to Martin's murder.
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