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Another check is to look at the mainspring.
At some point in the past Marlin used a mainspring assembly that could be adjusted by moving the retention plate to a different slot.
If the plate is set to far forward the tension is too tight and the action is very tight.
Later rifles used a sort of "L" shaped retention design, and this can get screwed up by improper disassembly.
And as above, you want the action screw tight but not TOO tight.
For "off the wall" stuff, check to see if a screw in the receiver side wall or receiver top is too long. Sometimes replacements were installed that were too long.
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