A heart beat cycle indicating device for indicating to a firearm operator a defined stage of the heart beat cycle of the firearm operator includes a heart beat cycle monitoring unit for monitoring the heart beat cycle of the firearm operator and a heart beat cycle indicating unit for indicating to the firearm operator a specific stage of the heart beat cycle. A heart beat cycle override unit may be used in combination with the heart beat cycle indicating device to prevent discharge of a firearm during a specified stage of the heart beat cycle of the firearm operator. An automatic firing assembly for automatically firing a firearm when the firearm is aligned with a target comprises a target detection unit in combination with a trigger actuation unit for actuating a firearm trigger. Methods for making a heart beat cycle indicating device and an automatic firing assembly are disclosed, together with methods for operating a firearm in combination with a heart beat cycle indicating device or an automatic firing assembly.