do you need a permit to buy a crossbow
In some nations, such as Canada and the United States, crossbows are not subject to any specific regulation, in most there are laws, which differ widely. Each jurisdiction has its own definition of a crossbow, and in some cases pistol-sized crossbows are treated differently. There may be minimum ages for possession, and sales of both crossbows and bolts may be restricted. Specific rules around hunting use are also common.
Laws on crossbows