In 2003-2004, the Small Arms Survey completed a series of research projects across 20 nations of the southwest Pacific.1 One of these, a survey of the proliferation of small arms and firearm-related violence in the strife-torn Southern Highlands of Papua New Guinea (Alpers, 2005), relies on a range of background information, field interviews from 19 communities, weapon descriptions and summaries of supplementary material which are not included in the published work. For the benefit of governments, donors, development agencies, NGOs and others with a stake in curbing the proliferation of small arms in Papua New Guinea, this additional information is provided here.