Like Virginia7 said Timney makes the replacement trigger for it. It is a drop in except for the part where the safety needs to be filed down. If you file it too much you end up with a safety that ceases to work so be careful. A new safety is not available from Ruger except to a gunsmith. You would have to return the gun to Ruger for them to install a safety and you will be charged for it. I have installed a few Timney triggers on the new Rugers and this may be one reason I don't buy them anymore. I also had a gunsmith I know stone the sear and trigger on a MK II and replace the spring but it still had the minutest creep and didn't at all feel crisp. The Timney conversion makes the trigger feel extremely crisp.