Abstract: An ejector for firearms which use projectiles without cases of the new design with a perimetric primer. Such an ejector may be used on any type of gun which is equipped with a radial percussion system designed to percuss such projectiles.Used with the projectiles without cases, the ejector should eject from the detonating chamber of the gun only those projectiles on which the firing pin has not provoked the detonation of the charge at the moment of percussion.At the same time since it is impossible to prevent from time to time during firing the occurrence of defective projectiles which remain in the barrel, during the phase of introduction into the detonating chamber the ejector should be able to hook onto every single projectile, retaining hooked onto it only those which, due to defects, remain in the detonating chamber and leaving all the others free to come out of the mouth of the barrel.