Precise figures about the numbers of illegal firearms in the European Union (EU) are lacking, but several indicators point to their widespread availability and accessibility. According to the Small Arms Survey, over half of the estimated total number of firearms held by civilians in the EU in 2017 were unlicensed. While most of these citizens had no criminal intentions, their illicit firearms could be used for self-harm or domestic violence, or end up in the hands of criminals or terrorists. Firearms seizures suggest that the EU illicit firearms market is made up mostly of shotguns, pistols and rifles, with converted or convertible weapons also frequently appearing. Illicit firearms trafficking is driven by criminal demand, with organised crime groups that engage in firearms trafficking also involved in other forms of criminality.