Volquartsen Firearms Pistol Magazine with Base Pad Mamba-TF 22LR 10 Rounds. Also compatible with MK IV pistols. Not compatible with 22/45 pistols. Specifications for Volquartsen Firearms Mamba-TF 22LR 10 Rounds Pistol Magazine with Base Pad: Manufacturer: Volquartsen Firearms Gun Make: Volquartsen Firearms Ruger Gun Model: Ruger Mark IV Caliber: .22 Long Rifle Magazine Capacity: 10 Round Color: Gray Condition: New Country of Origin: USA Features of Volquartsen Firearms Mamba-TF 22LR 10 Rounds Pistol Magazine with Base Pad Volquartsen Magazine Follower Button and SureFeed Magazine Springs come pre-installed; Magazine base pads are also available separately; Works with our Volthane Grips as well as our Laminated Target Grips Package Contents: Volquartsen Firearms Mamba-TF 22LR 10 Rounds Pistol Magazine with Base Pad What firearm models does the manufacturer say Volquartsen Firearms Mamba-TF 22LR 10 Rounds Pistol Magazine with Base Pad is compatible with? The manufacturer says that Volquartsen Firearms Mamba-TF 22LR 10 Rounds Pistol Magazine with Base Pad is compatible with Ruger Mark IVVolquartsen Firearms VF4FM-HB: Pistol Magazine with Base Pad Mamba-TF 22LR 10 Rounds