"Duck hunters don't know whether to plan ahead in the hope they will receive their licence before the season starts, or to give the season away," he said.
"Several hunting families have told us that firearm licensing delays mean they will only purchase one game bird licence this year, so they can secure their traditional hunting spot for the season."
He described the backlog as evidence that the police were either unable or unwilling to prioritise their administration of the Arms Act.
"This backlog was entirely foreseeable following the government's changes to how police conduct their vetting," he added.
"The firearms confiscation and compensation schemes, along with the effects of Covid-19, have strained police resources. Law-abiding firearms owners are not receiving the level of service they deserve."
Creating a further barrier for those wishing to shoot would also have negative flow-on effects for businesses that supported the season, and were already "hurting" due to Covid-19.
Game bird season licences go on sale today. Pegging day is Sunday March 28, the season opening on Saturday May 1.