Arentol offered some very good advice. I recently purchased one of the R92's in 357/38 and the action was pretty stiff out of the box. I decided to try and smooth it up myself by oiling it up and working the action several hundred times. I worked it both with and without the hammer down. It smoothed up very nicely in no time at all and is now smoother than my 39M, and equal to my 60 year old 39A. I was amazed at the difference a couple hours of working the lever could make...big difference.
Best of luck...