One of the things I really enjoy after I buy a gun in the class of the Rossi is to take it apart and see if it needs any attention inside.The Rossi is very responsive to this and you get to learn how to repair any possible future problems.
If I were you I would find a good youtube video and then take the rifle apart looking for rough spots and burrs.After proper oiling I would only take the rifle down once a year unless a problem crops up.
One thing to not remove is the either the left or right cartridge guides unless you are experiencing feeding problem.
Mine is an older one and after dis-assembly I ran a Q-tip through the inside surfaces looking for burrs and after carefully smoothing them the little carbine is as slick as a sewing machine!