Akademik Veri Yönetim Sistemi
3rd International Conference on Design, Research and Development, İstanbul, Türkiye, 13 - 15 Aralık 2023, ss.1-8
In semi- and fully automatic assault rifles, the gas port plays a critical role in the recoil mechanism of the rifle and affects rate of fire (cadence, shots per minute). A certain amount of energy is needed to recoil the gun, and this mechanical energy will be provided by the gas passing through the gas port on the barrel at the speed of sound. If the location and diameter of the gas port are not suitable, the gun cannot be armed as the gas at the flow and pressure that will provide the required arming energy cannot be delivered. A larger diameter gas port at the same location on the barrel results in a higher flow rate of gas and an increase in the rate of fire. If the gas port is brought closer to the chamber, the rate of fire increases due to the increase in pressure, temperature, loading time and mass flow rate. Bringing the gas port closer to the chamber also reduces the weight and cost of the weapon, but there is a limit to this.
In this study, it is aimed to determine the location and diameter of the gas port on the barrel that will provide the desired fire rates, taking into account the other components that make up the recoil mechanism of semi- and fully automatic assault rifles (gas-piston, mechanism, and buffer assembly). Correctly determining the location and diameter of the gas port will ensure that the gun operates at the desired rate of fire, both by reducing the recoil force and by increasing the useful life of the parts.