From 29 March to 2 April 2021, the UNODC Global Firearms Programme, in close collaboration with UNODC Sahel Programme, organised a regional training of trainers aimed at practitioners from the criminal justice chains of ten countries in West and Central Africa (Benin, Burkina Faso, Cameroun, Chad, Cote d’Ivoire, Democratic Republic of Congo, Mali, Mauritania, Niger and Senegal). Among them were known experts from different services, including Police, INTERPOL National Central Bureaus, customs, prosecutors, magistrates, judges, National Commissions on Small Arms and Light Weapons, as well as from the G5 Sahel Police Component. In addition, newly recruited UNODC staff from Benin, DRC and Niger also joined the training. During the week-long activity, trainees focused on various themes linked to the fight against illicit firearms trafficking, including legal frameworks, conducting investigations, tracing and international cooperation in criminal matters inter-alia. In addition, they were joined by an adult learning methodologies expert to strengthen their skills in the development and delivery of capacity building activities aimed at adult learners.