This is an UPDATE from a earlier post about installing a Wilson spring kit in a S&W 686. I finally got to the range and shot my 686 with the spring kit installed. I shot 150 rds. of my reloaded 38 special, using CCI primers. The single action trigger pull was really nice and the double action pull was super, but I did have 2 light primers strikes, but the rounds fired on the second hit. When I got home I put in a fired small pistol primer, minus the anvil between the main spring tension screw and the spring. The primer material is about .015 thick and it gave me a little more tension on the main spring. Yesterday, I went to a PPC practice and put another 120 rds. through the gun, I did have one light primer hit, again using CCI primers which are kind of hard. I did some reading on the S&W 686 and found out that there is a small problem with the firing pins as they come from the factory, they are too short, and if you do anything to lighten up trigger pull etc. you are going to have a problem with light primer strikes. I ordered a extended firing pin from Cylinder and Slide/Brownells. When I got home from the range, I installed the extended firing pin which measured .510, the stock pin measured .493 and removed the primer spacer from the tension screw. I think my problem has been solved, now have to go out to the range and give it a try.