https://theconversation.com/why-is-there-so-little-research-on-guns-in-the-us-6-questions-answered-92163

5. Has gun research stopped?The lack of funding has discouraged firearms research. Many researchers are employed within academia. In this publish-or-perish environment, researchers are under pressure to publish their work in academic journals and fund it through sources beyond their home institution. Without outside funding, their research often isn’t possible. Leading firearms researcher Wintemute says “no more than a dozen active, experienced investigators in the United States have focused their careers primarily on firearm violence.”