Volquartsen Firearms Magazine Base Pad for MK IV 22/45 5-pack Aluminium Black. CNC-machined from billet aluminum these base pads will make those days at the range even more enjoyable as you switch magazines with ease. These will work with factory magazines and will also convert any Ruger MKIII magazine into a Ruger MK IV 22/45 magazine. Specifications for Volquartsen Firearms Magazine Base Pad for MK IV 22/45: Manufacturer: Volquartsen Firearms Color: Black Fabric/Material: Aluminum Gun Make: Ruger Gun Model: Ruger 22/45 Condition: New Country of Origin: USA Features of Volquartsen Firearms Magazine Base Pad for MK IV 22/45 Only compatible with 22/45-style pistols Approximately 2oz Package Contents: Volquartsen Firearms Magazine Base Pad for MK IV 22/45 Only compatible with 22/45-style pistols What firearm models does the manufacturer say Volquartsen Firearms Magazine Base Pad for MK IV 22/45 is compatible with? The manufacturer suggests that Volquartsen Firearms Magazine Base Pad for MK IV 22/45 is compatible with Ruger 22/45Volquartsen Firearms VC4MB-5: Magazine Base Pad for MK IV 22/45 5-pack Aluminium Black