ProMag Steel Pistol Magazine Shadow Systems Cr920 9mm 32-Round Black 32RD. The springs are precision wound using heat-treated chrome silicon wire. Bases and followers are injection molded from polymers selected for their durability. The result is quality consistency durability and reliability. Specifications for ProMag Steel Shadow Systems Cr920 9mm 32-Round Pistol Magazine: Manufacturer: ProMag Gun Model: Shadow Systems CR920 Caliber: 9mm Luger Magazine Capacity: 32 Round Features of ProMag Steel Shadow Systems Cr920 9mm 32-Round Pistol Magazine Magazine body constructed of heat treated steel with black oxide finish Injection molded magazine follower Magazine spring formed from heat treated chrome silicone wire Package Contents: ProMag Steel Shadow Systems Cr920 9mm 32-Round Pistol Magazine What firearm models does the manufacturer say ProMag Steel Shadow Systems Cr920 9mm 32-Round Pistol Magazine is compatible with? The manufacturer says that ProMag Steel Shadow Systems Cr920 9mm 32-Round Pistol Magazine is compatible with Shadow Systems CR920ProMag SHD-A4-32RD: Steel Pistol Magazine Shadow Systems Cr920 9mm 32-Round Black