Introduction. For forensic ballistics is important to reconstruct the events of the use of firearms. One way of reconstruction is based on the position of spent cartridges relative to surrounding objects. Often required to establish the fact of secondary reflection in the collision of objects sleeves and find a place on the collision who after this microtraces. Goals and objectives. The purpose of qualitative research is interaction passing microtraces arising as a spent cartridge cases and on a rigid barrier, on which there is a secondary reflection sleeves. Methods. Studies conducted microtraces shot by electron microscopy with the use of a scanning electron microscope equipped with a prefix chemical element energy-dispersive microanalysis microanalysis. Microtraces on hedges and liner were obtained experimentally. Investigated microtraces product shots on hard barriers and obstacles on microtraces cover sleeve. Results. According to the obtained microtraces were identified chemical elements typical for product shots and great obstacles of chemical elements. When the characteristic chemical elements detected obstacles on the sleeve, it was believed that there was a mass transfer of particles with obstacles on the sleeve. When the characteristic chemical elements were found shot to hedge, it was believed that there was a mass transfer of particles from the core to the barrier. Revealed a characteristic appearance and particle size product shots. The differences between them and the particles coating barrier. Conclusion. Studies have shown the following: 1) on the spent cartridges are harder to detect microparticles tough obstacles than most traces of the barrier liner, 2) the obstacles in collision with a sleeve is relatively easy to detect the presence of particles characteristic of the product shots from a firearm.