Volquartsen Firearms Pistol Magazine 10 Rounds Black Mamba Ruger MK IV 22/45 w/ Base Pad Black. Also compatible with MK IV 22/45 pistols. Specifications for Volquartsen Firearms Magazine for Black Mamba and MK IV 22/45 Frames - 10 Rounds: Manufacturer: Volquartsen Firearms Gun Make: Ruger Volquartsen Firearms Gun Model: Volquartsen Black Mamba Ruger Mark IV 22/45 Caliber: .22 Long Rifle Magazine Capacity: 10 Round Color: Black Country of Origin: USA Weight: 2 oz Package Contents: Volquartsen Firearms Magazine for Black Mamba and MK IV 22/45 Frames - 10 Rounds Magazine Base Pad VC4MB What firearm models does the manufacturer say Volquartsen Firearms Magazine for Black Mamba and MK IV 22/45 Frames - 10 Rounds is compatible with? The manufacturer suggests that Volquartsen Firearms Magazine for Black Mamba and MK IV 22/45 Frames - 10 Rounds is compatible with Ruger Mark IV 22/45 Volquartsen Black MambaVolquartsen Firearms VC4FM: Pistol Magazine 10 Rounds Black Mamba Ruger MK IV 22/45 w/ Base Pad Black