Volquartsen Firearms CNC-Machined Disconnector for MKII and MKIII Black. The machining process allows us to make several design changes to the the way the disconnector functions. We have added material that increases rigidity over the current design. This increased rigidity not only improves trigger pull but also will improve overall functioning as it will prevent any binding or interference that can be found on the prior design and factory design. This is due in part to variances in the factory frame tolerances. The CNC-machined design also features an integral pin without the step found on the factory design. We have also machined the pin that comes in contact with the trigger plunger round to reduce friction as it moves over the trigger plunger. Fits Ruger MKII MKIII and 22/45. Included Accessories: Not for use with MK IV pistols Specifications for Volquartsen Firearms CNC-Machined Disconnector for MKII and MKIII: Manufacturer: Volquartsen Firearms Color: Black Fabric/Material: CNC-Machined Gun Make: Ruger Gun Model: Ruger Mark III Country of Origin: USA Package Contents: Volquartsen Firearms CNC-Machined Disconnector for MKII and MKIII What firearm models does the manufacturer say Volquartsen Firearms CNC-Machined Disconnector for MKII and MKIII is compatible with? The manufacturer says that Volquartsen Firearms CNC-Machined Disconnector for MKII and MKIII is compatible with Ruger Mark IIIVolquartsen Firearms VC2DN: CNC-Machined Disconnector for MKII and MKIII Black