Scott: I have installed two triggers in two M77 MKII's. One was a 7mm Rem Mag, and I used a Dayton-Traister. Fitting on that one was my worst nightmare, and I will never do it again. The second trigger was a Timney, and it went on a M77 MKII SS 30-06. Installation was a "no brainer", and you only have to file the safety engagement. Don't let that scare you away, it's the easiest thing you'll ever do. Just DO NOT USE A DREMEL TOOL to do it. I used a small file, and slowly worked it into engagement. The whole job took a whopping 30 minutes, and my group sizes shrunk by at least half. These new Rugers really can be made to shoot with a new trigger and floating the barrel. Ruger will tell you different, but every one that I've seen shoots better without any pressure on the barrel. Good luck, and email me if you run into any problems.