A 35-year-old man has been sentenced to 20 years in prison for the murder of former Rebels bikie boss Nick Martin.

The former soldier, who can’t be named due to a suppression order, was also convicted on three other charges.

He used a high-precision rifle to shoot Martin in a crowd of people.

The sentence was reduced from life because he will testify against the alleged mastermind of the killing.

The sentence will be backdated to March and he will be eligible for parole in 18 years.