I took my Ruger Mark IV to the range yesterday after installing the Volquartsen accurizing kit. I used the Utube video as a guide and it took me about 1:30 to finish installation (I had several interruptions). The kit went in without to much trouble and the trigger feels worlds better. I did butcher the safety lever screw because the screw was so tight that I stripped the allen head socket of the screw. I had to cut a straight slot in the head so I could use an impact driver to loosen and remove the screw. That was really the only problem I had installing the kit and I should be able to get a replacement screw from Ruger. All things considered I think that it was worth the trouble. I love the new trigger pull being at 2.5 lb and my group got a little better. I hope once I get use to the new trigger I will be able to improve my group even more.