Nowadays the archaeology of Modern times actively develops. Gunflints and fire-steel flints take an important place in a complex of the material remains of the 17–18^th centuries. The considerable collection of such products (259 pieces) comes from the fortress of Lutik (Sed-Islam, in Osman tradition) in the lower reaches of Don. The fortress existed from 1660 to 1741. The occupation layer contains both “Turkish” and “Russian” archaeological remains, and it is difficult to separate them from each other. The publication contains the quantitative and qualitative characteristics of this specific category of archaeological findings. Materials are described in terms of the Stone Age archaeology. For understanding of specifics of a flint complex, a gunlock, lead bullets and iron fire-steels are also described in the publication.