The concensus here is JM Marlins are the safe bet. Providing the rifling is still good and the bore isn't rusty/ed, I'd buy the 1998 JM Marlin 45-70 LTDIII instead of the later Remlin model.
The1998 JM Marlin will always hold it's value. Because it's THE original JM Marlin .........the Remlin not so much. However there are reports of good to dent remlins now. I wouldn't trust a 2015 model though. At all.