A ballistics expert has testified that bullet cartridges found in the aftermath of a bikie firefight and firebombing in suburban Canberra could have been discharged from an O'Malley man's shotgun.
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Axel Sidaros, 25, is on trial in the ACT Supreme Court for eight charges including attempted murder, arson, inflicting grievous bodily harm, and aggravated burglary.
He is accused of being one of four men to sneak onto the property of former ACT Comancheros president Peter Zdravkovic on June 28, 2018, shoot at him through a glass door, and set several of his cars alight including a BMW, a Mercedes-AMG and a black ute. Mr Zdravkovic lost the top of a finger in the attack.
Mr Sidaros denies any involvement and has pleaded not guilty to all charges.
Taking the witness stand on Tuesday, an Australian Federal Police firearms examiner told the court he found several 12 gauge shotgun cartridge cases at Mr Zdravkovic's Calwell address after the incident.
The court previously heard it resulted in blood staining the street outside, glass being shattered throughout the living room, and a bullet narrowly missing a neighbour after it blasted through a fence.
All of the 12 gauge cartridges been fired except one, the expert said.
Police officers told the court this week they later searched Mr Sidaros' O'Malley home and seized tan work boots, gloves, a tin of ammunition, and three firearms including an Adler lever action shotgun.
The work boots and gloves were of interest because they shared similarities with clothing items pictured in CCTV footage of the attack, the police said.
The firearms expert later tested the Adler shotgun, shooting three 12 gauge cartridges from it. He analysed the "tool marks" made on the cartridges as a result of them being fired from the weapon.
Tool marks in the case of firearms were impressions left on a cartridge like an indent or pattern, the expert said. The marks depended on a gun's manufacturing process.
When the expert compared those markings to the ones on a cartridge at the scene of the firefight, he determined there were several similarities. He told the court the tool marks on a cartridge found at Calwell indicated it was consistent with having been ejected from the Adler shotgun.
The expert also found several .45-calibre cartridges and .270 cartridges at the house, he said. The latter were consistent with having come from a rifle, which the expert understood was found in the ceiling of Mr Zdravkovic's laundry area.
Mr Hickey previously told the court Mr Zdravkovic shot back at the attackers with the rifle.
The trial continues.