The undergraduate thesis depicts the development of a design solution for a cylindrical bolt of a firearm. The parts of the bolt action mechanism are briefly explained, and the basic division of the bolt is described. This is followed by an analysis of existing products on the market and patents for cylindrical bolts and their components, which are explained and supported by pictures providing a detailed description. Based on the analyses, a functional structure is created, describing the flow of energy, signals, and materials through the system. According to the functional structure, a morphological matrix of functions is generated, consisting of various solutions used for the creation and development of concepts. Concepts are created as 3D CAD models using the SolidWorks 2020 software package, and after creation, they are evaluated according to predefined criteria. For further elaboration, the concept with the highest rating is selected, and the dimensioning of the bolt and calculation of all critical components begin by selecting the material, caliber, and firing pin. Furthermore, a simulation of the bolt head is conducted in Ansys Workbench Student 2023 for the prescribed maximum pressure of the caliber. At the end technical documentation is provided also using SolidWorks 2020 software package.