Two Perth men have been sentenced to life in prison with lengthy minimum terms for luring another man into bushland and shooting him dead.

Ben Mansfield, 35, and Daniel Marchesano, 21, were found guilty by a Supreme Court jury of murdering 31-year-old Michael Pruiti in October 2013.

Mr Pruiti was lured by Marchesano into bushland in Pickering Brook, where Mansfield was lying in wait with a rifle.

He shot Mr Pruiti in the head.

His body was then burnt and his legs amputated before being wrapped in plastic and buried in scrubland at Karragullen.

His remains were not found for two months.

Justice Peter Martino said the crime was aggravated by the "disrespectful" treatment of Mr Pruiti's body and because his family did not know what had happened to him for two months.

"The murder was planned ... the murder was unprovoked. The victim was lured to a location where he couldn't defend himself," he said.

The court heard the two murderers were methamphetamine users with Marchesano's lawyer, Paul Yovich SC, saying his client's mind was "drug-addled" at the time.

Mr Yovich also claimed Marchesano had only taken part in the murder because Mansfield had threatened to kill him and members of his family.

However, Justice Martino rejected the submission, saying Marchesano entered into an agreement and knew Mansfield would kill Mr Pruiti.

'Nobody deserves to die like that'

Michael Pruiti's mother Debbie said her son was a "really great kid". ( ABC News: Joanna Menagh )

Outside the court, Mr Pruiti's mother, Debbie, welcomed the sentence.

"I think that's great, I couldn't be happier and I just hope they find God while they're in there and I find forgiveness in my heart for them," she said.

Mrs Pruiti said her son did not deserve to die the way he did.

"Nobody deserves to die like that and what they did to him afterwards, really that's evil," she said.

Mrs Pruiti described her son as "a really great kid" who loved playing in his band.

She also warned of the dangers of the drug ice.

"It's the most evil drug on the planet," she said.

"It attacks your mind and then it destroys your family and it destroys your soul and something like this can happen."

Mansfield was sentenced to life with a 26-year minimum, while Marchesano, who was given credit for his youth and lack of prior convictions, was sentenced to life with a 23-year non-parole period.

The sentences were backdated to the time of the their arrests in December 2013.