The KRISS MagEx and MagEx2 is a magazine extension kit designed to increase the capacity of your Glock magazine.


The original MagEx was designed only for the Glock 21 magazine (.45 ACP) and increased magazine capacity to 25 rounds.


Released in January 2019, the MagEx2 is an updated version of the original KRISS MagEx Magazine Extension, and is available in several calibers. The kit is caliber-specific and designed only for full size, standard capacity, factory Glock magazines, Gen 3 or newer, of the correct model for the caliber.

Mag Compatibility
9x19 Kit G17 17rd
.45 ACP Kit G21 13rd
10mm Auto Kit G20/G40 15rd

The MagEx2 is currently available for Glock 21, Glock 20, and Glock 17 magazines, increasing your magazine capacity to 30 rounds of .45 ACP, 33 rounds of 10mm, and 40 rounds of 9mm.

Extended Capacity
9x19 40 rds
.45 ACP 30 rds
10mm Auto 33 rds

We do not make a MagEx2 kit for .40 S&W nor any other calibers at this time.

We do not guarantee fitment nor performance of the MagEx nor MagEx2 kit with aftermarket magazines nor other magazine models nor calibers. It is designed for use with factory Glock models as shown above.

Not compatible with reduced capacity 10rd magazines.