Agree with Dave Marsh. If you want to make that trigger pull better, you may think about moving the trigger pivot point to a better position. Many other threads that discuss this.
Also, you could take a Dremel along with a cotton polishing attachment, apply some FLITZ or other polishing compound and "shine up" all the bearing points of the lock device, along with the sear. I just did this and dropped the trigger pull weigh on a T\C Hawken from over 10-lbs to right a 7-lbs on the single trigger. (Set trigger doesn't count).
Be VERY careful that you don't change the sear angles (unless you know what you're doing) and by all means, DO NOT use a stone!!