It's,like I say ,a trademark, not all rifles and shotguns by Marlin have them,only thier better grade ones,most of the time, since 1922 .If you look at a rack of guns and your a Marlin seeker you know ,right away ,where most of them are by that bullseye.As a rule thier cheaper grade guns such as the "Glenfield "marked ones don't have them.The ''bullseye'' is also used on other advertisements and literature.Shootrj2003