Abuzar Sultani has admitted to being involved in five killings, including the murders of a trio of other gang rivals during a reign of terror he inflicted across in Sydney in 2016.
The 35-year-old, a former high-ranking Rebels bikie, also pleaded guilty to the murder of fellow gang member Mark Easter on June 23, 2015.
During a sentence hearing in March over that killing, Sultani said he believed it was "me or him" when he shot Mark Easter dead before disposing of his body.
But Justice Mark lerace said he doubted Sultani's version of events during his sentencing in the NSW Supreme Court on Friday.
Sultani earlier told the court Easter had requested he buy a large amount of the drug precursor pseudoephedrine, which he did not want to do, prompting a tense interaction between the men in June 2015.
The bikie said he shot Easter, causing him to slump over a chair, when he realised his rival had a firearm and he felt "exposed".
But Justice lerace found no evidence Sultani seriously feared he would be harmed and his account of shooting Easter was "inherently unlikely".
Sultani subsequently shot Easter several more times to ensure he was dead before placing him in a bathtub with his body submerged in bleach and ice.
The corpse was found dumped three days later in bushland with a bag tied around the head.
Justice lerace said Sultani had shown no evidence of remorse after the execution-style killing and was not "troubled by the inhumanity, immorality or impact upon others".
He also noted a text-message exchange between Sultani and another associate in which the killer wrote "Spiderman has been snookered", a reference to Easter's nickname.
Justice lerace said the killing was most likely unplanned due to the time taken to dispose of the body and it was not possible to determine whether Sultani acted alone or with others.
In delivering his sentence, the judge took into account Sultani's guilty plea and handed him a maximum term of 31 years and six months with a non-parole period of 23 years.
But he noted the penalty would be "academic in terms of its impact on the offender's life", given he was already serving three life terms behind bars.
Appearing via a video link, Sultani rubbed his eyes and mouth in apparent frustration as the sentence was delivered.
Sultani has previously admitted to being involved in four murders, including the 2016 killings of Penrith Rebels enforcer Michael Davey, drug dealer Mehmet Yilmaz and mafioso Pasquale Barbaro.
The first two fatal shootings were motivated by commercial criminal gain, but personal hatred fuelled the third.
He also pleaded guilty to the 2013 murder of Nikola Srbin, which happened during what a judge described as the early stages of his "notorious career as a gangster, hitman and killer".
Another judge dubbed Sultani "a serial killer who is yet to exhibit bona fide empathy for his victims or to recover moral direction" during his 2021 sentencing for the 2016 murders.
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