This is a 4-16 with the larger AO think it's a 50 (not 100%) It came on a gun I bought and I really like it but don't have a need for it now that the gun was sold. scopes in pretty nice shape the ring marks on it look just to be from the tape the guy put inside the rings. scope has regular CH's. asking $310 shipped TYD LOOKING TO MOVE QUICKLY!!!