This is the Mec-Gar Springfield Hellcat 9mm 12-round magazine. 

These aftermarket Springfield Hellcat magazines from Mec-Gar deliver an additional round over the OEM Hellcat magazines while maintaining the same durability and reliability!

The high-quality steel body is finished off with a white polymer base pad and follower, creating a unique and functional combination of aesthetics and toughness. They’ve been extensively endurance tested and have withstood any and all tasks thrown their way.

To top it all off, rear-facing witness holes allow for quick and easy capacity assessments, making them ideal for everything from concealed carry to home defense.

Don’t settle for the standard 11-round Hellcat magazine when you can grab a few of these 12-rounders!