I installed this and tried it out but it turned out my rifles bolt had a defect and the rifle had to go back to CZ for a repair to the bolt. I think I am going to try a different setup when it gets back, this is great if you want to go down to 2lbs but its not recommended it be adjusted any lower from DIP. That's why I am going to try something else, I would like 1-1.5lbs. But for 2lbs and up these work great and took all the creep out of my trigger. 30 shipped TYD. Comes with allen wrench to adjust but I lost the original package. Check them out at DIPinc. I can provide pictures if needed but its basically new. Had it in my rifle for about 3 days.