This is the Tyrant CNC +5/4 Magazine Extension for Glock 17, 19X, 22 Pistols. 

Adding five rounds of 9mm or four rounds of .40 S&W to your Glock has never been quicker or easier!

CNC machined from aerospace-grade aluminum, this extension comes with a flawless finish and adds to your magazine’s overall durability. The added weight causes your magazine to drop with little to no effort, and the knurling makes it easy to grab in any conditions. 

Thanks to the retention plunger technology, you can install it within seconds without tools. Each magazine extension is made in America and backed by a lifetime warranty!

Note: This extension does not work with 10-round magazines or Magpul PMAGs.

Grab a few extensions and upgrade all of your compatible Glock mags!

DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.