triggershims.com has shims available that might improve that easily without any special tools or mods. I agree with OK. Shoot the hell out of it and don't fret. 586/686 are some of S&W's finest models and a pleasure to handle and shoot. Personally I wouldn't send anything back to Smith unless it needed machine work. Their quality control is inconsistent. Get a book and learn to do a little smithing. Most things I have resolved needed nothing more than little polishing and lubrication, sometimes a shim or so. Hey but that's just my opinion and I have a revolver affliction.