The Dayton Traister kit can be installed using a dremel tool and taking your time. The instructions aren't good, but I used a 98 bolt as an example. Getting the angle right and polishing it are the details.
I had to get a Wolff 24lb spring as the Dayton spring wanted to bind inside the bolt.
The main advantage is shorter lock time. Though that is a questionable improvement. I can tell the difference in lock time from my unaltered Husqvarna, but I don't think the rifle is better and won't bother doing it again. Just practice good hold and you shouldn't need it.
