The Accurizing Kit for the Ruger MK IV will provide a crisp, clean 2.5lb trigger pull. This kit will eliminate the magazine disconnect. If your pistol says "Ruger Mark IV" anyplace this kit fits it. Kit fits all variations of the Ruger MK IV (including 22/45)Hammer and Sear are wire EDM Cut from A2 Tool SteelIncludes allen wrenchesIncludes medium strength loctiteComplete installation instructions are available onlineOther trigger colors here