I found a hard used one today. Older Marlins are scarce in my neck of the woods.
Looking at the bore with a scope shows several major rust spots, a through cleaning and polishing will reveal if it will be a great shooter or just so-so. Hoping for the former as I have a new Glenfield scope to put on it.
The rifling is micro groove, I think. It's straight cut, no twist. I have never seen a Micro Groove bore so asking is this normal?