A hunter who visited a gun club frequented by the accused mass murderer, Brenton Tarrant, says he raised concerns about the club with police, but nothing was done.

Photo: Google Maps

Fifty people have died in the Christchurch mosque shooting on Friday, the worst terror attack in New Zealand history.

Pete Breidahl posted a video on Facebook about his visit to the Bruce Rifle Club, south of Dunedin, a few years ago.

He said he was so concerned about some people at the club's 'homicidal fantasies' that he went and spoke to a police arms officer.

"The fact that they talk about zombie apocolypses, 'rifles for combat for when they're overweight and [expletive] useless', the fact that 'you can take my guns from my cold dead hands."

Bruce Rifle Club's vice president Scott Williams has confirmed to RNZ that Brenton Tarrant has been a member since last year.

He said he never gave anyone cause for concern.

Mr Williams said the club is shocked and stunned and members are assisting police.