Trying to figure out which parts are needed to take the Ruger MKII, MKIII and 22/45 to the next level? Look no further than the Pistol Competition Kit. This kit includes our Accurizing Kit , Bolt Tune-Up Kit and CNC-Machined Disconnector. The Pistol Competition Kit is designed to produce a crisp, clean 2.25 trigger pull, eliminate stovepipes, and eliminate failures to fire!