"One person at the address being searched was arrested on outstanding warrants while two others were arrested for drug related offending," Mr Ross said.
"On our return for follow up enquiries today another person was arrested for drug offending and we are still investigating in relationship to the circumstances around possession of the shotgun."
Mr Ross said the focus by police on gun-related dishonesty offending continued today with two stolen guns recovered from a property shortly before 8.30am.
"Assisted by members of the Waikato Armed Offenders Squad our team went to a Dinsdale address where a stolen shotgun, .22 cal rifle and a Ghurkha Kukri knife were recovered.
"While searching the home the remnants of methamphetamine use were found and three people now face charges, and our enquiries into this matter are also still continuing."
Mr Ross said the correlation between dishonesty offending, illicit drugs and illegally held firearms was of continuing concern for police.