The gun used to kill NSW police accountant Curtis Cheng was allegedly handed over just a suburb away in the hours before the fatal attack.
Documents tendered to court on Friday claim Talal Alameddine met with Raban Alou between 1.40pm and 2.55pm at Merrylands on October 2 and gave him a .38 Smith & Wesson revolver.
Around two hours later, 15-year-old Farhad Jabar allegedly used the gun to shoot Mr Cheng outside police headquarters in Parramatta.
Alou's lawyer said the 18-year-old would be fighting charges he aided and abetted Jabar to carry out a terrorist act.
Court documents also allege Alameddine, 22, damaged and hid a mobile phone and SIM card on October 7, with the intention of hindering evidence of the killing.
Neither Alameddine or Alou appeared or applied for bail when their matters came before separate Sydney courts on Friday.
Alou's court mention came more than a week after he was arrested in pre-dawn raids over Mr Cheng's shooting.
Since then, his lawyer, Moustafa Kheir, has said the teenager has spent more than 200 hours in custody in which he has been interrogated by detectives.
He wasn't charged until Thursday.
"The evidence that the charges rely on are circumstantial evidence. This means there is no direct evidence," Mr Kheir told reporters.
"Raban will be fighting these charges."
Alou's father says his son has been brainwashed while associating with the wrong crowd.
Izat Alou says he has taught Raban good values and the importance of helping others, but somebody has got to the 18-year-old.
"Somebody brainwashed him," Mr Alou, from Wentworthville in Sydney's west, told AAP on Friday.
"My son is born here, even I don't pray and I'm not a practising Muslim.
"We hate these bloody ISIS."
Alou's matter will return to court on December 16.
Alameddine, who was arrested in Merrylands on Thursday, has been charged with breaching a firearms prohibition order and hindering police.
His matter will return to court on December 10.
Mr Cheng's funeral will be held at Sydney's St Mary's Cathedral on Saturday morning.
Jabar was shot dead by police at the scene.
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