The KRISS MagEx and MagEx2 is a caliber-specific magazine extension kit designed to increase the capacity of select Glock standard capacity magazines.

KRISS MagEx (Discontinued)

The original MagEx was designed only for the Glock 21 magazine (.45 ACP) and increased the original 13 round magazine capacity to 25 rounds.

While it was possible to sometimes force load more than 25 rounds, for maximum reliability it was advised to only load up to 25 rounds.

KRISS MagEx2 Kit

Released in January 2019, the MagEx2 is an updated version of the original KRISS MagEx Magazine Extension, and is available in several calibers and colors. 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.

The MagEx2 is currently available for full size Glock 21, Glock 20, and Glock 17 magazines, increasing your magazine capacity as shown in the table below.

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

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

Not compatible with compact nor sub-compact magazines.

Not compatible with reduced capacity 10rd magazines.

KRISS MagEx2 Magazine

The KRISS MagEx2 Magazine is a pre-built magazine with no assembly required. We use a factory Glock magazine body & follower and install the MagEx2 kit of the specified caliber for the magazine.