Greatly improves trigger pull - Volquartsen Firearms MK IV Pistol Competition Kit

Trigger upgrade: Reduced the trigger pull from 4.5 pounds to 2.25 pounds. Reduced my group size by 60%. A little tricky to install because of the small size of the parts and the limited space. I used a vise to hold the grip while doing the install. The extra "hand" was a definite help. There are several videos out there that show how to do the install that are better than the Volquartsen video ( but even that video is helpful.) Bolt upgrade: Can't tell if it improved anything or not. I haven't fired enough rounds yet to tell if I had any problems with soft strikes or failure to extract. I didn't realize it was part of the package (really just wanted to lighten the trigger pull). The extractor was the most difficult part, but not too bad with the vise to hold the bolt and letting me use both hands to manipulate the original extractor and plunger.