Glock CO₂ Pistols

Why choose a Glock CO₂ replica?

Glock is one of the most recognisable names in the modern pistol market. Its functional design, polymer frame and distinctive profile have made models such as the Glock 17 and Glock 19 internationally recognised.

Officially licensed CO₂ replicas reproduce key features of the corresponding Glock models, including their overall dimensions, ergonomics, markings, controls and external design. Depending on the version, they may also feature a metal slide, blowback operation or an MOS optic interface.

Who makes Glock CO₂ pistols?

The Glock CO₂ pistols in this category are supplied by Umarex under official licence from Glock. This licence allows authorised model names, logos, markings and characteristic design elements to be reproduced.

This category nevertheless has a clear Glock-specific purpose: it helps users compare different Glock CO₂ air pistols. Other platforms distributed by Umarex belong in their corresponding brand or general CO₂ categories.

Glock 17, Glock 19 or Glock 19X?

These three model families differ primarily in size and overall concept. Ammunition, blowback operation, magazine design and MOS compatibility must then be checked for the individual version.

Glock 17 CO₂: the classic full-size replica

The Glock 17 CO₂ is one of the main reference points in the licensed Glock replica range. Its full-size layout provides a larger grip and slide assembly and is available in several generations and technical configurations.

The range can include classic Glock 17 models, Glock 17 Gen 4, Glock 17 Gen 5 and MOS versions. Selected variants may also be available with different colours and external finishes.

Glock 17 Gen 4 and Gen 5

Gen 4 and Gen 5 refer to different generations of the original Glock design. The corresponding replicas reproduce selected differences in grip design, slide profile and external appearance.

The generation name alone does not define the complete airgun mechanism. Pistols within the same family can still use different ammunition, magazine systems or blowback configurations.

Glock 19 CO₂: the compact alternative

The Glock 19 CO₂ brings the compact G19 concept to an officially licensed air pistol. It is an attractive choice for users who prefer a smaller format than the full-size Glock 17.

The family can include standard versions and MOS configurations from different generations. For a closer look at this platform, read our Glock 19 CO₂ pistol review.

Glock 19X CO₂: the crossover concept

The Glock 19X CO₂ follows a crossover concept that combines characteristics from different Glock formats. It therefore has a clearly different profile from both the full-size Glock 17 and the compact Glock 19.

Its distinctive Coyote finish also makes it one of the most recognisable Glock replicas. Depending on the version currently available, the Glock 19X family may feature blowback operation or MOS optic preparation.

Glock 17 vs Glock 19 CO₂

Size is only one part of the decision. The ammunition, weight, magazine system, blowback operation and MOS preparation of the individual version should also be compared.

Glock CO₂ blowback pistols

On a Glock CO₂ blowback pistol, part of the available gas cycles the slide during firing. This movement provides a more dynamic action and increases the mechanical realism of the replica.

Blowback does not automatically provide greater power or better accuracy. Because some CO₂ is used to move the slide, shot count can be lower than with a comparable fixed-slide model.

For a more detailed explanation, read our guide to the blowback system, its benefits and CO₂ consumption.

What does MOS mean on a Glock CO₂ pistol?

MOS stands for Modular Optic System. On a Glock CO₂ pistol, it identifies a configuration prepared for selected compatible optical sights.

This concept can be found on variants such as the Glock 17 Gen 5 MOS, Glock 19 Gen 4 MOS, Glock 19 Gen 5 MOS or Glock 19X MOS. The precise configuration must always be confirmed on the individual product page.

Standard Glock or Glock MOS?

Steel BBs or airgun pellets?

Many Glock CO₂ air pistols fire steel BBs. It should not, however, be assumed that every version uses the same type of ammunition. Some configurations may be designed for airgun pellets or employ a different magazine system.

A steel BB is spherical, while a conventional airgun pellet normally has a diabolo profile with a head, narrow waist and skirt. Even when both are available in 4.5 mm or .177 calibre, they are not automatically interchangeable.

How to choose a Glock CO₂ pistol

Which Glock CO₂ pistol suits each user?

• For a classic Glock replica: the full-size Glock 17 is the natural starting point.
• For a more compact pistol: the Glock 19 provides a smaller overall format.
• For a distinctive crossover design: the Glock 19X combines characteristics from different Glock formats.
• For more dynamic operation: choose a version specifically identified as blowback.
• For a red-dot sight: choose an MOS version and then verify the exact optic and mounting compatibility.
• For simpler operation and CO₂ efficiency: a non-blowback model may be the more suitable option.

Care and safe handling

• Read the manual: CO₂ capsule installation and magazine loading can differ between models.
• Use the correct ammunition: follow the manufacturer’s calibre, material and projectile specification.
• Protect the seals: use only maintenance products suitable for CO₂ airguns.
• Avoid prolonged pressurised storage: follow the manufacturer’s instructions for removing a pierced capsule.
• Wear eye protection: steel BBs can ricochet from unsuitable or excessively hard surfaces.
• Use a suitable target area: select an appropriate pellet trap and comply with local requirements.

Frequently asked questions about Glock CO₂ pistols

Are Glock CO₂ pistols officially licensed?

The relevant Umarex models are produced under official licence from Glock. This allows them to use authorised model names, markings and characteristic design features.

What is the best Glock CO₂ pistol?

There is no single best model for every user. The Glock 17 provides the classic full-size format, the Glock 19 is more compact and the Glock 19X follows a crossover concept. The next choice is between blowback, fixed-slide and MOS configurations.

Do all Glock CO₂ pistols have blowback?

No. Some models use a moving blowback slide, while others have a fixed-slide design. The individual product specification identifies the system used.

What ammunition do Glock CO₂ pistols use?

Many models use steel BBs, but not every version necessarily has the same barrel or magazine system. Always check the ammunition specified for the individual pistol.

What is the difference between a Glock 17 and Glock 19 CO₂?

The Glock 17 follows a full-size format, while the Glock 19 is more compact. Weight, ammunition, blowback operation and other specifications can also vary between individual versions.

What do Gen 4 and Gen 5 mean?

These names identify different generations of the original Glock model. On a CO₂ replica, they mainly indicate the design generation reproduced and do not, by themselves, define the complete airgun mechanism.

What does MOS mean on a Glock?

MOS stands for Modular Optic System. It identifies a configuration prepared for selected compatible optics, subject to the correct interface and mounting system.

Can any red-dot sight be fitted to a Glock MOS?

No. Compatibility depends on the optic footprint, pistol interface, mounting plate and screws. MOS does not provide universal compatibility with every red-dot sight.

How many shots can one CO₂ capsule provide?

Shot count depends on the pistol, temperature, shooting pace, condition of the seals and whether the model uses blowback. There is therefore no single figure that applies to every Glock CO₂ pistol.