What should I do if I only hear a click?
Wait at least 30 seconds. Point the barrel in a safe direction (bank of earth) and remove the cartridge. There are generally two possible explanations for it failing to ignite. Either the primer did not ignite as it should or the firing pin could not strike the primer properly. The reason for this could, for example, be a damaged spring, the wrong case or that the breech block is not closed properly. Make sure that there is nothing in the barrel before the next shot.