KRISS MagEx2 Kit Glock 21 .45 ACP Magazine Extension

Description

The KRISS MagEx2 is a straightforward capacity extension system built to work with factory Glock 21 magazines. Drop your existing standard 13-round mag body into this kit and you're looking at a 30-round total capacity for .45 ACP. That's 17 additional rounds without any complicated modifications.

KRISS MagEx2 Component Breakdown

The kit includes three main components: an extended baseplate, an outer sleeve, and an extended spring. All are constructed from lightweight reinforced polymer composites that keep the added weight minimal while maintaining the durability you need. There's no guesswork about fitment because this extension is specifically engineered for factory Glock 21 Gen3 through Gen5 magazines. Simply disassemble your existing mag, slide the components together, and you're done. No tools required.

Real-World Considerations for Loading

One thing to keep in mind with extended magazines is that the increased spring tension makes hand-loading more difficult as capacity climbs. After the first dozen rounds or so, you'll feel it. This is normal, not a defect, and plenty of people grab a magazine loader like the UpLULA to save their thumbs. The tradeoff is worth it for many users who prioritize capacity, especially for range training or pistol-caliber carbine work where the extended mag really shines.

Compatibility and What to Know

This extension is designed exclusively for factory standard Glock 21 full-size magazines. Aftermarket magazines or compact/subcompact variants won't work with this kit because the spring tension is tuned for OEM mag bodies and followers. The kit works beautifully with KRISS Vector platforms and Glock-compatible pistol-caliber carbines, but also pairs seamlessly with standard Glock 21 handguns if you're looking to build magazine reserves for training.