There are many reliable semi autos.
However, I would never take anything for my Marlin Bolt 25N. I believed Ive had it since new for around 20+ years ago, so its old rusted but shoots groups dreams are made of with the cheap Thunderbolts. I opted for the black plastic stock years ago.
I believe they still make them with the micro-grooved barrels like mine. It took me several 50 count boxes to get the lead build up in the barrel, but once I did the groups continued to tighten. Never clean the bore unless it starts getting off poi. Naturally cant shoot as fast as the semi but the trade off of reliability and accuracy are worth it imo, and its easier to clean the action.