Volquartsen Firearms Target Pistol Trigger Ruger MKII MKIII and MK IV Gold. Specifications for Volquartsen Firearms Target Pistol Trigger Ruger MKII MKIII and MK IV: Manufacturer: Volquartsen Firearms Color: Gold Fabric/Material: CNC-Machined Caliber: .22 Long Rifle Gun Make: Ruger Gun Model: Ruger Mark IV Ruger Mark III Ruger Mark II Country of Origin: USA Features of Volquartsen Firearms Target Pistol Trigger Ruger MKII MKIII and MK IV MKII or MKIII; Gold Package Contents: Volquartsen Firearms Target Pistol Trigger Ruger MKII MKIII and MK IV What firearm models does the manufacturer say Volquartsen Firearms Target Pistol Trigger Ruger MKII MKIII and MK IV is compatible with? The manufacturer says that Volquartsen Firearms Target Pistol Trigger Ruger MKII MKIII and MK IV is compatible with Ruger Mark II Ruger Mark III Ruger Mark IVVolquartsen Firearms VC2TT-GT: Target Pistol Trigger Ruger MKII MKIII and MK IV Gold