Cylinder is scored. Check compression with tester.hone and new rings. Too expensive to go oversize and bore. Look everything over and measure it before proceeding as other things can be worn out too.
In order to check the ring end gap with a feeler gauge, you have to dismantle the entire engine. A bit impractical wouldn’t you say, unless you are rebuilding it?!If you have no measuring tool for the bore and the cyl looks like a hone will suffice , check the ring end gap . Feeler gauges are cheeeep . There are videos for that procedure and what's tolerable .