I had one on a Ruger M77. It worked decent when it was adjusted. If you get the sear engagment off, then it will fire when the bolt closes. To make sure that will not happen, you need to make your trigger a bit heavier (like 3-4lbs or so) which might be just the ticket for a younger shooter. They do install easy and, the one I had, was totally adjustable. There was no way in heck it would go down to the 14oz or so advertised, but it did get it down to 1.8lbs with a little work. They are probably quite different for every gun. The one for my Ruger was just a sear to compliment an already adjustable factory trigger and it was only $30 or so.