Volquartsen Firearms Pistol Magazine Base Pads for Ruger MK IV 5-pack. CNC-machined from billet aluminum these base pads fit both the Mamba-TF and Ruger MK IV magazines. These are the perfect complement to our target grips that extend below the base of the frame. Specifications for Volquartsen Firearms Ruger MK IV Pistol Magazine Base Pads: Manufacturer: Volquartsen Firearms Color: Black Fabric/Material: Billet Aluminum Caliber: .22 Long Rifle Gun Make: Volquartsen Firearms Ruger Gun Model: Ruger Mark IV Condition: New Country of Origin: USA Magazine Capacity: 10 Round Features of Volquartsen Firearms Ruger MK IV Pistol Magazine Base Pads CNC-machined from billet aluminum; Fit Mamba-TF and Ruger MK IV magazines Package Contents: Volquartsen Firearms Ruger MK IV Pistol Magazine Base Pads What firearm models does the manufacturer say Volquartsen Firearms Ruger MK IV Pistol Magazine Base Pads is compatible with? The manufacturer says that Volquartsen Firearms Ruger MK IV Pistol Magazine Base Pads is compatible with Ruger Mark IVVolquartsen Firearms VFTB-5: Pistol Magazine Base Pads for Ruger MK IV 5-pack