yes please add the marks to let others know. A fellow soldier came home with my son and had a rifle he got from his Grandpa to hunt with. Had some ammo and wanted to check the scope and shoot the gun to make sure he was good. Long story short the rifle was not a 30/06 as mark but a 300. He had some blow back on his face which caused some bleeding but nothing to bad. Grandpa forgot he reamed it out and could have injured his grandson just because he did not mark the barrel.