I have a 336T and a 336CS. Neither has the Bullseye. Hard to tell if they ever had Bullseye because both have a swivel mount screw where the Bullseye should be. Did they ever have the Eye? Does the screw reduce the value? Did the previous owners make a mistake by replacing the Eye with a screw? Doesn't matter. I love my Marlin Lever Gun. The older I get, the more I learn, the more I get confused.