Ruger MK I, II, III, and 22/45 Speed Strip KitsQuick and Easy Dis-assembly | Improved Trigger & Magazine PerformanceThese Speed Strip conversion kits from Majestic Arms make dis-assembly of your Ruger Mk .22 Pistol easy and quick. No more busted fingernails and frustration with the original factory dis-assembly process. With the Speed Strip Kit installed, dis-assembly is a simple process to unscrew the bolt stop pin and remove the bolt. Three Different Models... Here's How to Choose:If you have a Ruger Mk I, Mk II, or Mk II 22/45, get the "Original" Kit or the "Fits All 3.2 Upgrade" Kit for improvements in trigger performance.If you have a Mk III or Mk III 22/45, you have two choices: The "Basic Mk III" Kit for the Speed Strip conversion. Or, the "Fits All 3.2 Conversion" for Speed Strip conversion plus Magazine Disconnect removal. (The Fits All 3.2 Conversion actually works in Mk I and Mk II as well as Mk III and all 22/45 pistols. The 3.2 Kit includes a Mk II Bushing that gives improved trigger performance in all three.) What is the "Magazine Disconnect"? This is a politically mandated feature on Mk III and Mk III 22/45 pistols where the gun cannot fire if the magazine is removed. It's not a popular feature because it makes for a poor trigger pull and it makes magazines drag when you want them to eject. Many people remove the Magazine Disconnect feature by converting their Mk III back to the Mk II trigger bushing. Which Kit Should You Buy? The Fits All 3.2 Conversion works with all three generations ( Ruger Mk I, II, III, and 22/45) converts all to the preferred generation Mk II trigger, and removes the magazine disconnect from MK III (includes a Mk II hammer bushing)... This is the most popular kit. We also have the Original Mk I/II and Basic Mk III kits but these do not include the Speed Strip Mk II hammer bushing.