This article discusses the importance of the Portal of Amateur Collaborators and the Register of Individual Finds of the Archaeological Map of the Czech Republic (AMCR-PAS) in preserving data from metal-detecting activities in the Czech Republic. The context and legal framework of metal detecting in the country are explained along with the establishment of AMCR-PAS. The collaboration between amateur and professional archaeologists is also discussed. The recorded finds are analysed in terms of chronological, typological and spatial distribution. The AMCR-PAS system is recognised as a crucial tool for the preservation of data from metal detecting, and provides a valuable resource for national and transnational archaeological research, enabled especially by aggregation of AMCR-PAS data in the ARIADNE infrastructure. Overall, this article highlights the significance of the AMCR-PAS system and its potential to contribute to the understanding of the country's rich archaeological heritage. It also examines the shortcomings and challenges that accompany applying the system in practice.