These ProMag magazine bodies and followers are injection molded from strong, lightweight polymer. The springs are precision wound using heat-treated chrome silicon wire. The result is quality, consistency, durability and reliability. Gun or Pistol Type: Ruger 1022* Caliber: .22 LR Material: Polymer Capacity: 50 Round Drum Color: Black *Fits Ruger 1022 .22LR Autoloading rifles only, does not fit bolt action rifles