Arms produced in the European Union account for a substantial part of the global arms trade. Although these arms are covered by export regulations, they may be used to commit war crimes, individual murders and enforced disappearances, as well as in violations of international humanitarian law. This study shows that arms manufacturing and exporting companies must take responsibility for how their military equipment is used when they can foresee that their products may infringe human rights or figure in breaches of international humanitarian law and international crimes. Defence companies� lack of human rights due diligence concerning how their products are deployed is alarming, especially because these companies operate within the UNGP framework. Building on the UNGPs and the OECD Guidelines it�s possible to bring home to these companies exactly what is expected of them.