I just put a Timney in a Ruger all weather 223. Make sure you have a good file or a dremel handy and it will be easy. The only problem I had was with the spring on the timney was to light and the gun would slam fire even after adjusted all the way out but I put the factory spring in with the new trigger and sear now it breaks at a nice crisp 2.5 pounds. You will have to file the saftey tab to the correct height on the Timney is why you need the file.