Be carefull grinding/polishing sear and hammer engagement,if you dont know what you are doing easy to ruin your parts or end up with a full auto.Here is what I do.Drift out the pin on the front end of the trigger assembly that holds in the mag release,its spring and the sear(makes sure the hammer isnt cocked first).Take a toothbrush and solvent and scrup the hell out of the channel the sear block slides in.Clean the sear sides,checking for burrs.Lightly polish off any metal burrs you find,apply a light coat of grease to the sides of the sear,reassemble.You will be supprised in the difference this will make to the overall trigger pull,however it wont do anything for trigger weight,you can order a spring kit from wolff gunsprings to lighten trigger pull.Good luck.