Abstract: A device for determining projectile velocity at a gun barrel muzzle, the device including at least two sensors spaced some distance apart be integrated on or directly in the gun barrel. During the passage of the projectile, the sensors undergo expansion due to the gas pressure at the base of the projectile and the pressure of the rotating band of the projectile on the inside of the gun barrel. This expansion is converted to an electric signal, which, if necessary, is amplified and then supplied to a signal processing device connected on the output side of the sensors. High-temperature-resistant quartz sensors in the form of longitudinal measuring pins are preferably used as the sensors, which are installed either in a carrier ring on or around the gun barrel or directly in the gun barrel.