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The paper presents the design characteristics of a blockade immobilizing long-barrel Mauser-type and related firearms. The main functional feature of the blockade is securing the weapon from unauthorized use. This stems from the legal regulations that require each owner to secure the weapon from access by unauthorized persons. The design solution presented in this work, together with the assembly and disassembly kit, as well as the method of activation and deactivation are protected by patents: PL 230049, PL 229706 and PL 229807. The design features of the individual elements of the blockade, through which the entire assembly obtains its expected functionality, have been defined. The influence of changes in the selected geometric parameters of the main elements on the efficiency of the blockade is presented. The presented results of design work confirm the effectiveness and reliability of the presented weapon blockade.