A youth was given a warning last weekend after police responded to a report of a person armed with what appeared to be a handgun.
According to Mounties, officers responded to the report on May 26 at about 10:20 p.m. on McArthur Island, where they located a group of youths attempting to flee.
Police said they caught up with the teens and located a pair of 3D-printed brass knuckles.
Mounties said none of the youths were in possession of a handgun or wearing and were subsequently released.
A youth matching the description from the initial report was located the next day and turned over an airsoft handgun to police.
He was provided a warning for brandishing an airsoft pistol in public.