A vehicle, in particular a tank, having a turret, on which a gun having a large-calibre gun barrel is secured, and comprising an auto-loader positioned behind the turret, via which auto-loader ammunition can be automatically supplied to the gun barrel. In order to achieve simplified automatic loading of the gun barrel with ammunition, the auto-loader is replaceably secured on the outside of the turret as a separate, modular unit. A magazine located in the auto-loader for receiving the ammunition can also be designed as an interchangeable magazine that can be replaced. An electronic system of the auto-loader is housed in the vehicle, specifically in the turret. The selection of ammunition in the auto-loader and the conveying out of the auto-loader are carried out via at least one mechanical interface, e.g. a power take-off, between the turret and the auto-loader.