I'm a pistol target shooter normally, so all rifles/carbines basically are unfamiliar. Without the rear sight, I had my face way down trying to look for something to line the front sight up with. All I could find was the half-moon groove in the wooden stock. This caused me to be practically looking over the rifle butt which resulted in taking the kick in the cheek. Replacing that missing rear sight will resolve my aiming problem without a doubt. Appreciate the helpful comments as I go in search of the appropriate rear sight. Still would like to pop a leaf or flip rear sight in there as that's what Hubby says he remembers the carbine having. How do you lose the rear sight off your carbine that you never shoot?