Volquartsen Firearms Competition Bolt Ruger MKII/MKIII/MKIV/Ruger 22/45 Gold. Expertly CNC machined to fit a wide variety of Ruger firearms these Pistol Slides & Slide Parts give you a competitive advantage to eliminate stovepipes and failures to fire. NOTE: When used with MKIII pistols the loaded chamber indicator must be removed from the pistol. Specifications for Volquartsen Firearms Ruger Mark II-IV Competition Bolt: Manufacturer: Volquartsen Firearms Color: Gold Finish: Tin Fabric/Material: CNC-Machined Gun Make: Ruger Gun Model: Ruger Mark IV Target Ruger Mark IV Ruger 22/45 Ruger Mark II Target Ruger Mark III Ruger Mark II Condition: New Country of Origin: USA Features of Volquartsen Firearms Ruger Mark II-IV Competition Bolt: Extended Bolt Racker machined integral to the bolt for improved manual cycling of the bolt - no more pinched fingers; Increased hardness; Low residual stress; Increased lubricity; Low coefficient of friction; Improved wear resistance; Requires much less lubrication Package Contents: Volquartsen Firearms Ruger Mark II-IV Competition Bolt Exact Edge Extractor SureStrike Firing Pin What firearm models does the manufacturer say Volquartsen Firearms Ruger Mark II-IV Competition Bolt is compatible with? The manufacturer says that Volquartsen Firearms Ruger Mark II-IV Competition Bolt is compatible with Ruger Mark II Ruger Mark III Ruger Mark II Target Ruger 22/45 Ruger Mark IV Ruger Mark IV TargetVolquartsen Firearms VC2BT-G: Competition Bolt Ruger MKII/MKIII/MKIV/Ruger 22/45 Gold