Trangmar was taken into custody about 3am as he came out of the Te Anga Tavern, in Te Anga, a small settlement 48km northwest of Te Kuiti, said Te Kuiti police sub-area manager, Senior Sergeant Rob Van Kalken.
The tavern is closed over winter but a police patrol noticed a light on at the rear of the tavern shortly after midnight.
A silent cordon was set up around the building and when Trangmar came out about 3am he was arrested without incident.
He did not have any weapons with him.
Trangmar was being interviewed by police this morning. No formal charges had been laid as yet, but it was likely he would at least face an aggravated robbery charge, a police spokesman said.
Mr Van Kalken said this morning's result was the best possible outcome for all concerned and came about in a large part from considerable cooperation received from the public which police were grateful for.
"We're grateful that this matter was able to be resolved without further incident and thank all those who gave us their assistance."
Armed police and a helicopter had been combing the area around Otorohanga and Waitomo for Trangmar since he allegedly terrorised a number of residents starting on Sunday night, when he allegedly punched his neighbour and threatened him with a firearm.
On Monday night he allegedly fired a gun during an attempted robbery of a Waitomo bar.
