Marlin 15Y
Got these from the DCM many (50) years ago. Scopes are for shit. I put one of those flat groove-to-weaver mounts on it and this cheap NCStar dot sight. They still shoot fine. Walmart of all places had the mount, it's only 1/4" high. I think they were made by Kwik-sight or uncle mikes back in the day, now they come right from china.