Wayne Dundon and Nathan Killeen have been found guilty in their non-jury trial of murdering Roy Collins in Limerick in 2009.
Ms Justice Iseult O'Malley, presiding gave the verdict of the three-judge court, after reading out an almost two-hour judgement.
Wayne Dundon (aged 36) of Lenihan Avenue and his co-accused Nathan Killeen (aged 24) of Hyde Road, both in Prospect, denied any part in the killing at the Roxboro Shopping Centre on April 9, 2009.
Roy Collins was killed by a single shot to the chest fired by a gunman who entered the Coincastle amusements at around midday on April 9, 2009.
The non-jury court heard during the 29-day trial that Mr Collins was at work around noon that day when a gunman entered his amusement arcade and discharged a single shot, hitting him in the chest. He was conscious for a time, but his life could not be saved.
The court was satisfied with the prosecution case that Wayne Dundon directed the murder from prison, Nathan Killeen was the getaway driver and another man, James Dillon, was the gunman.
During the trial, Steve Collins, father of the victim, told the court that in April 2009 he was running The Steering Wheel pub and his son Roy was operating the Coin Castle Amusement Arcade. He said he had been running the pub for 22 years, while Roy had been running the amusement arcade for about five years.
He said he left for work at 7.40am with an armed escort as he had every day. His son Roy popped in for a chat around 11am and then left to open up the amusement arcade.
Mr Collins said that around noon one of his barmen told him there was "a fellow bleeding next door".
He ran next door to the arcade and saw his son crouched on his knees holding himself. Roy said: "I'm after being shot Dad," and when he asked him did he see who shot him, his son replied: "No."
Mr Collins said he did his best to comfort his son and his son told him how much he loved him and his mother. Then the gardaí and an ambulance arrived and Roy was taken to hospital.
Steve Collins has described Roy's killers as "cowardly evil men devoid of any semblance of mercy and humanity".
He broke down in tears as he told the court in a victim impact statement that his son paid the ultimate price for standing up to the wrath of these people.