I understand, but a bit surprised Ruger didn’t extend some type of courtesy
They are normally exceptional CS
I'm not surprised at all.
Ruger bought the name and the manufacturing rights to the Marlin firearms, they don't have any obligation to honor the warranties on firearms that they don't produce.
I wonder if Ruger acquired the existing parts inventory for the Marlins that were produced pre-Ruger? Probably not, 'cause outfits like CDNN and GPC usually buy that sort of stuff for pennies on the dollar. When Winchester/USRA went out of business, CDNN bought a lot of their inventory of firearms and loose stocks and have been selling them ever since 2006.
FWIW, I bought an XT-22VR on sale at Cabela's in 2015 for $142 and it is nearly as accurate as my Anschutz, Remington, and Winchester target rifles that each cost at least 4x more than what the Marlin cost. I did put it in a Boyds Pro Varmint laminated stock for an improved fit and for the aesthetics, but the accuracy didn't change.