One theory is the shooting is part of an internal feud within the UDA’s North Antrim brigade.
The victim, who is in his 40s, was shot in both legs and in one arm, at a house on the Finvoy Road in Ballymoney, Co Antrim.
The attack was reported to police at about 9.45 pm on Thursday night.
The man was taken to the Causeway Hospital but his injuries are not believed to be life-threatening
Police have appealed for anyone with any information about the attack to contact them.
It is the second shooting in north Antrim in two days.
In the early hours of St Patrick’s day, March 17, a man was shot at Dunluce Road in Bushmills.
Police say officers received a report at around 12.30am that a man in his 30’s had been shot a number of times in both legs as he sat in his car.
It was reported that a number of masked men were involved in the incident.
The injured man was taken to the Causeway Hospital to be treated for injuries which are not thought to be life threatening.