Police arrested a 42-year-old Waianae man Tuesday who allegedly threatened with a handgun an 18-year-old man who was demonstrating a product at the older man’s house.

Police said the householder became upset during the demonstration and allegedly threatened to shoot the man.

The gun was allegedly not registered, police said.

Patrol units responded and arrested the 42-year-old on suspicion of first-degree terroristic threatening and posessing an unregistered firearm.

The man was later released pending investigation.