We strip a newly acquired marlin levergun whether it be a 'JM' or a 'REP' down and clean, deburr and polish the internal parts.
We remove only the outstanding metal burrs in contact friction areas.
Roughness is areas that never contact other parts is a non issue.
Paw will check the chamber and polish it if necessary.
We replace the stock trigger with the wild west guns 'trigger happy' kit and the stock hammer spring with the wolff spring from brownells.
We pull the mag follower and spring and swab out and lightly lubricate the mag tube and replace the cheap plastic follower with the wwg metal follower from brownells.
We reassemble the rifle and break it in by cycling the action 2 or 3 hundred times while watching a hockey game or movie.
One thing we do is file a little metal off the band spring that closes the loading gate but not too much.
You don't want that gate too sloppy.
Our 2 marlin leverguns are as smooth as churned butter and never jam.
Stripping and reassembling the marlin leverguns (336, 1894, 1895, guide guns) is kids stuff compared to stripping winchesters and brownings.
The best way to clean the bore of a marlin levergun is to remove the lever, bolt and ejector and cleaning from the chamber end.
You can replace the lever, bolt and ejector in 5 minutes.