KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit Review

A Practical Look at the KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit

For those of us who push the boundaries of our 10mm firearms, increasing magazine capacity is often a natural progression. The KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit promises just that, aiming to boost the round count of factory Glock magazines without sacrificing reliability. Having spent over a decade in demanding environments, from dusty workshops to unforgiving field conditions, I’m always looking for upgrades that offer genuine utility, not just cosmetic flair. My search for a more robust and higher-capacity solution for my Glock 20 led me to this particular kit from KRISS USA.

The initial spark for this purchase came during extended range sessions. While the standard capacity of my Glock 20 is adequate for many situations, there are times, especially during defensive drills or extended plinking sessions, where a few extra rounds can make a significant difference. I’d previously experimented with less reputable extensions, which often resulted in feeding issues or fragility. The thought of a 33-round magazine extension for a 10mm firearm was undeniably appealing.

Upon receiving the kit, my first impression was one of solid, no-nonsense construction. The reinforced composite materials felt durable, and the design looked purposeful, eschewing unnecessary ornamentation. It felt like something built to withstand the rigors of use rather than just sit in a display case. I had briefly considered some other aftermarket magazine extensions, but their often-cheaper plastic construction and mixed reviews for reliability steered me away. This KRISS USA offering, with its focus on reinforced materials, seemed like a more promising investment. A sense of cautious optimism, a familiar feeling for any gear enthusiast, settled in as I prepared to install it.

Real-World Testing: Putting KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit to the Test

First Use Experience

My initial testing took place at a familiar outdoor shooting range, under clear skies but with the ambient dust of the range itself a constant companion. I fitted the Mag-Ex2 kit onto a standard Glock 20 magazine, ensuring the components were properly seated. The installation itself was straightforward, requiring no specialized tools beyond what one might typically have for basic firearm maintenance.

During this first outing, I focused on the fundamental function: feeding. I ran through several magazines loaded with various 10mm ammunition types, from full-power loads to some lighter practice rounds. The KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit performed admirably. There were no failure-to-feeds or stovepipes, which can often be the bane of higher-capacity magazine setups, especially with potent calibers like 10mm. The extended spring provided consistent tension, pushing rounds up reliably.

The only minor quirk was a slight adjustment needed for the magazine to seat fully on a closed slide on the first few attempts. This is not uncommon with magazine extensions, and after a few repetitions, it became second nature. It felt intuitive, offering a satisfying “clunk” as it locked into place.

Extended Use & Reliability

Weeks turned into months, and this extension kit became a regular fixture on my Glock 20 magazines. It accompanied me on various range days, and even spent time in my workshop, being loaded and unloaded frequently as I tested different loadouts and practiced administrative handling. The reinforced composite materials have shown no signs of cracking or excessive wear, even after being dropped once on a concrete floor during a hasty reload.

In terms of durability, the outer sleeve has a few minor scuffs from incidental contact, but these are purely cosmetic. The critical function – reliably feeding rounds – has remained unwavering. There’s no noticeable stiffness developing in the follower or spring, and the overall integrity of the kit feels as robust as it did on day one.

Compared to other magazine extensions I’ve used, many of which were significantly more expensive, this KRISS USA kit stands out for its combination of durability and consistent performance. Budget options often compromise on material strength or spring tension, leading to reliability issues down the line. This particular extension feels like a more premium, albeit less complex, upgrade. Maintenance is as simple as cleaning the base Glock magazine; the extension itself requires no special care beyond occasional wiping down.

Breaking Down the Features of KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit

Specifications

The KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit is engineered to transform your standard Glock 20 or Glock 40 magazine into a 33-round powerhouse. This kit comprises three key components: an extended baseplate, an outer sleeve, and an extended spring, all constructed from durable and lightweight reinforced composites. This material choice is critical, offering resilience without adding excessive bulk or weight that could compromise handling.

The 10mm Auto caliber specification is paramount; this kit is specifically designed for the potent ammunition fired from these particular Glock models. It is compatible with Glock 20 and Glock 40 pistols across generations 3, 4, and 5. The magazine capacity it achieves is an impressive 33 rounds, a significant jump from the typical 15-round capacity of a standard Glock 20 magazine.

This significant increase in capacity is made possible by the extended length of the polymer sleeve and the custom-designed spring that ensures proper feeding of the additional rounds. The choice of polymer is beneficial for its shock absorption properties and resistance to corrosion, which is a major plus for gear that might be exposed to the elements. When compared to the standard Glock magazine, which offers a more compact footprint, this extension clearly prioritizes ammunition volume.

Performance & Functionality

The primary function of this KRISS USA kit is to reliably increase magazine capacity, and in this regard, it excels. The 33-round capacity is consistently delivered with every magazine loaded. The feeding mechanism, aided by the extended spring, works seamlessly with both the factory follower and the magazine body.

A major strength of this extension is its unwavering reliability. Even during rapid firing drills, where magazine changes are frequent and subjected to stress, the Mag-Ex2 kit has consistently allowed for smooth seating and immediate feeding. This level of dependable performance is what I look for in any equipment that might be used in critical situations.

The only slight drawback is the increase in magazine length. While this allows for more rounds, it does make the magazine slightly more cumbersome for concealed carry if that is a primary concern for the user. However, for range use, competition, or duty applications, the increased capacity far outweighs this minor ergonomic shift. It meets and arguably exceeds expectations for a capacity-enhancing product.

Design & Ergonomics

The design of the KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit is focused on robust functionality. The reinforced composite construction feels substantial and gives confidence in its longevity. The outer sleeve is textured in a way that provides a decent grip, even with gloved hands, which is a thoughtful touch for fieldwork.

While it’s an extension, it integrates aesthetically with the Glock magazine body and the KRISS Vector platform it’s often associated with. The overall feel in hand is solid; there are no sharp edges or loose parts. The installation process is simple, and once attached, it feels like a cohesive part of the magazine rather than an add-on.

The extended length does alter the pistol’s balance slightly when a full magazine is inserted, but this is a direct consequence of the increased round count and is manageable with practice. The improved grip surface on the base of the extension is a subtle but appreciated ergonomic enhancement, aiding in magazine extraction.

Durability & Maintenance

Based on my experience, the KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit is built for longevity. The reinforced composite materials are highly resistant to impact and environmental factors. After months of use and some incidental abuse, there are no signs of structural compromise.

Maintenance is refreshingly straightforward. The kit is designed to work with the existing Glock magazine follower and spring. Cleaning involves the same process as cleaning any standard Glock magazine – disassembling it, cleaning the components, and reassembling. The extension itself can be wiped down with a mild cleaner.

A potential area to watch out for, as with any magazine extension, is the integrity of the retaining mechanism, but KRISS USA seems to have engineered this well. I haven’t observed any signs of the extension becoming loose or detaching under stress, which is a common failure point for lesser designs.

Accessories and Customization Options

This product is a kit only, meaning it’s designed to work with your existing factory Glock 20/40 magazine body and follower. Therefore, there are no separate accessories included with the kit itself. The primary “customization” is the transformation of a standard magazine into a higher-capacity unit.

KRISS USA does not offer different color options for this specific kit; it comes in a standard black finish that matches most Glock firearms. Its compatibility is exclusively with the specified Glock magazine types. This means you won’t be adapting it to other brands or significantly different magazine designs. The focus here is on enhancing the factory Glock magazine.

Pros and Cons of KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit

Who Should Buy KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit?

This KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit is an excellent choice for range shooters, competition participants, and law enforcement or security professionals who carry or utilize the Glock 20 or Glock 40 in 10mm. Anyone who finds themselves needing more ammunition on hand without compromising the ergonomics of their pistol will benefit. It’s particularly suited for those who value reliability and durability in their firearm accessories.

Those who primarily focus on deep concealment might find the extended magazine profile a bit too obtrusive. If your main requirement is an ultra-compact handgun, this extension would likely detract from that goal. For users who need sterile, single-use, or very specific medical-grade magazine components, this product is not relevant.

For maximum utility, I would suggest pairing these extended magazines with a good quality chest rig or magazine pouch designed to accommodate longer magazines. This ensures easy and quick access when you need to perform a rapid reload under pressure.

Conclusion on KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit

The KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit delivers on its promise of increased capacity and reliable performance. Its robust construction from reinforced composites inspires confidence, and its consistent feeding of potent 10mm Auto rounds makes it a worthwhile addition for any Glock 20 or 40 owner looking to enhance their firearm’s utility. The value proposition is strong, offering a significant boost in ammunition count for a reasonable price, especially when compared to purchasing entirely new, high-capacity magazines from other manufacturers that may not offer the same level of durability.

I would highly recommend this kit to anyone who prioritizes round count and proven reliability for their 10mm Glock pistol, particularly for range use, competition, or tactical applications. If your primary focus is extremely deep concealment, you might want to consider the trade-offs in magazine length, but for most users seeking more firepower, this extension is a solid, dependable choice that has held up exceptionally well through my testing.