G19x 80% by Geisler Defence (Expert Review, Build Tips, Test)

We call this the "P80 Killer"

One of the most popular 80% pistols in 2023 is the new Geisler Defence G19X GEN 1-3 Compatible 80% Blank.

We got our hands on a Geisler 19x frame (with an included jig) from Husky Armory and gave building one a go.

g19x 80 percent frame pistol

We will walk you through our experience building and testing the Geisler Defence G19X, highlighting its unique features and overall performance.

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Geisler G19x Frame & Jig

Referred to as the, “Polymer 80 Killer”, the Geisler Defence G19x brings a long time Glock favorite to 80% gun builders.

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Having built 100s of Polymer 80s we have learned quite a bit about the ins and out of 80% handgun building.

Starting this build we were skeptical but the Geisler Defence G19x, dare I say, outshines the Polymer 80 in a lot of ways.

Glock 19X Explained

Let’s start with the basics. What is a Glock 19x(G19x)?

The Glock 19X is a unique “crossover” 9mm pistol that combines the best features of two most popular Glock models:

  • The Full-Size Glock 17 Frame
  •  The Compact Glock 19 Slide

This hybrid design offers users an ideal pistol for various conditions and situations.

We appreciate the full grip provided by the Glock 17 frame, which enhances shooter control and makes it easier to handle from a carry position. The Glock 19X is capable of a 17+1 (flush fit) and 19+1 (gently extended) round capacity, which is advantageous for a lot of situations.

In terms of specifications, the Glock 19X is chambered in 9mm, facilitating manageable recoil and control.

G19x 80% Design and Features

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Geisler Defence Build Kits (G19x)

Husky Armory’s Geisler Defence build kit includes everything you need to build your own 80% pistol and head to the range.

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Polymer Frame

The Geisler Defence G19x 80% pistol frame boasts a high-quality polymer construction, proudly made in Israel, a country renowned for its exceptional craftsmanship.

80 percent g19x frame right

This durable material ensures a lightweight and robust build, while also providing compatibility with Glock 19 gen. 3 components, both OEM and aftermarket.

Grip and Texture

The grip is meticulously designed, incorporating an aggressive texture to offer superior comfort and enhanced control.

80 percent g19x frame left

This allows for confident handling even in adverse conditions. The grip size is a bit larger, enabling better accuracy and quicker target acquisition.

Slide and Sights

The G19x 80% pistol is compatible with G19-sized slides, allowing for OEM and aftermarket slide options.

how to build g19x geisler defence

This compatibility ensures a wide range of possible configurations including RMR cut, vented, OEM, bull-nosed, G19 slide kits.

The design is tailored to work flawlessly with Gen 1-3 components, providing reliable performance in various shooting scenarios.

Rails and Trigger

The Geisler Defence G19x 80% pistol frame includes a standardized rail system for accessory mounting, making it easy to customize with various attachments such as lights and lasers.

80 percent g19x frame overhead

The trigger system is crafted to accommodate Glock 19 Gen 3 components, promoting compatibility with trusted OEM and aftermarket G19 lower parts to deliver consistent and precise shooting performance.

Building the Geisler Defence G19x 80% Pistol

If you have done any Polymer 80 builds the Geisler Defence G19x 80% should be familiar.

geisler defense 80 percent g19x frame kit

Build Steps:

  1. Remove the majority of the rear rail tabs with Dremel or flat-cut end snips.
  2.  Remove the majority of the locking block tabs with Dremel or flat-cut end snips.
  3.  Remove the center barrel liner and cut with small wire snips or an X-Acto knife till nearly flush with the bottom of the 80% frame.
  4.  Starting with 60-grit sandpaper bring the rear rail tabs, locking block tabs, and barrel liner down to completely flush and “finished”.
  5.  Use 120-grit sandpaper to smooth all areas of removed polymer on the G19x frame.
  6.  Use 220-grit sandpaper to smooth all areas of removed polymer on the G19x frame.
  7.  Use 1500 grit or above slightly damp to go over all of these areas once more and you will see it now looks factory-finished.
  8.  Now secure the Geisler Defence 80% frame within the clear jig and use the provided screws to fasten the jig to the pistol frame.
  9.  Using a hand drill or drill press drill through the marked holes using the corresponding size drill bit. Be sure to drill through as center or “plum” as possible.

Note: Do not drill all the way through; only drill one sides holes at a time then turn the jig over and repeat.

More on Building the G19x 80%

How to Install the Geisler 19x Lower Parts Kit

See-Through Jig and Bits

To help with the milling process, we use the see-through jig provided by Geisler Defence.

The jig is designed to guide our milling bits as we work on the 80% blank, ensuring precise and accurate cuts. It’s important to follow the jig’s alignment and use the appropriate bits to achieve a professional result.

jig g19x geisler defence

The see-through feature of the jig also helps us monitor our progress, making it easy to identify and fix any mistakes as we go.

Rail Blocks and Pins

Once we have completed the milling process, we proceed to install the rail blocks and trigger pins. The rail blocks are designed to fit seamlessly within our G19x frame, providing the necessary support for our slide rail.

We secure the rail blocks in place using the pins, ensuring that they are properly aligned and seated. The result is a sturdy and reliable frame, ready for us to fully assemble the Geisler Defence G19x 80% pistol.

  • Install rail blocks
  •  Align trigger pins
  •  Secure and test for stability
  •  Install lower parts kit

By following these steps and utilizing the resources provided by Geisler Defence, we can build a high-quality G19x 80% pistol that offers a comfortable and versatile shooting experience.

Customization and Compatibility

Geisler Defence prioritizes customization possibilities and compatibility when it comes to their G19x 80% pistol. With a focus on aftermarket parts, you can easily and affordable complete your build kit.

included geisler defense 19x 80 kit

One of the standout features of the G19x is the G17-compatible grip size. This full-size grip allows for comfortable handling while still providing a compact slide for easier maneuverability.

Here are some key points about the compatibility of the G19x 80% pistol:

  • G17 compatible grip size
  •  G19 compatible slide size
  •  Gen 1-3 OEM/Aftermarket Compatible Parts Only
  •  Compact slides only
  •  Full-size magazines only

The smart ergonomics and high-strength reinforced polymer construction of the Geisler Defence G19x 80% pistol make it an ideal choice for those looking to customize their firearm without sacrificing reliability or performance.

Performance and Reliability

In our review of the Geisler Defence G19x 80% Pistol, we evaluated the performance and reliability of this popular firearm. When it comes to accuracy, the G19x proved to be relatively consistent, with minimal issues regarding shot placement.

During our testing, we experienced no major problems or malfunctions. Part of its reliability can be attributed to the reinforced polymer used in constructing the 80% frame. This material offers a combination of durability and lightweight handling that makes it suitable for various shooting scenarios.

As for ergonomics, the Geisler Defence G19x surpassed our expectations, providing a comfortable grip without compromising the overall handling of the pistol. The grip texturing is effective in providing grip control, even during extended shooting sessions. The forward lower edge is flared to further enhance control and stability.

geisler defence box

To summarize, our assessment of the Geisler Defence G19x 80% Pistol highlights its dependable performance and reliability, reinforced polymer construction, and agreeable ergonomics. This combination of features makes it a reasonable option for anyone looking to build their own Glock 19x clone.

Geisler Defence vs Polymer 80

If you’re considering building your own firearm, you might be wondering which kit to choose between Geisler Defence and Polymer 80. Here’s a breakdown of the key differences between the two:

Geisler Defence

  • High-quality components and precision engineering
  •  Designed to be a drop-in replacement for an existing Glock lower receiver
  •  Includes a complete trigger assembly, grip, and safety selector made from top-quality materials

Polymer 80

  • Designed to be a complete lower receiver that you can build from scratch
  •  Includes a polymer frame, jig, and all the necessary parts to build a complete lower receiver
  •  Offers the ability to customize your firearm to your exact specifications

Ultimately, the decision between the Geisler Defence and Polymer 80 kits comes down to personal preference and the level of customization you’re looking for.

geisler 19x build kit complete

If you’re looking for a quick and easy upgrade to your existing firearm, the Geisler Defence kit may be the better option. However, if you’re willing to put in the time and effort to build your own firearm from scratch, the Polymer 80 kit offers more customization options.

When discussing the Geisler Defence G19X 80% pistol, we need to consider the legal aspects surrounding its ownership and assembly. As an 80% frame, the G19X is not considered a complete firearm and is generally compliant with the Gun Control Act of 1968 (18 U.S.C. 921 (a) (3)).

However, there are specific state regulations that we must be aware of:

In California, for instance, the state requires that any completed 80% firearm, including the G19X, be serialized and registered with the California Department of Justice. Failure to comply with this requirement can result in legal penalties.

In Massachusetts, we must be cautious, as their gun laws are some of the most stringent in the nation. While it might be legal to possess an 80% frame, Massachusetts may have additional requirements for registration and serialization once the firearm has been completed.

Our recommendation for those interested in building a Geisler Defence G19X 80% pistol is to familiarize themselves with their respective state and local laws regarding the possession, assembly, and registration of such firearms.

States with 80% Frame Shipping Restrictions

  • California
  • Colorado
  • Connecticut
  • Delaware
  • Hawaii
  • Illinois
  • Maryland
  • Massachusetts
  • New Jersey
  • New York
  • Rhode Island
  • Washington

This helps to ensure compliance with legal requirements and keeps you out of trouble.


We observed the exceptional craftsmanship of the Geisler Defence G19x 80% Pistol throughout our review. The company has invested in creating a high-quality product for its users.

The innovative features of the G19x, such as the full-size grip combined with a compact slide rail length, contribute to a versatile and comfortable shooting experience. Geisler Defence’s commitment to quality is further highlighted by its materials, ensuring that the polymer used in the frame is of the highest standard.

In our assessment, the Geisler Defence G19x 80% Pistol possesses unique attributes that set it apart from other options in the market. This includes:

  • A textured surface offering superior grip and enhanced control
  •  Compatibility with GEN 1-3 components for greater flexibility
  •  An easy-to-assemble design requiring only minor machining to complete

As we conclude our review, it becomes clear that the Geisler Defence G19x 80% Pistol represents an excellent choice for those seeking an adaptable option. Its combination of advanced design and construction make it a standout in the 80% pistol market.

Written By

Dan M.
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