Glock 40: Features, Performance, and Best Uses

The Glock 40 Gen4 MOS is a formidable firearm for recreational and professional use. Its 10mm Auto caliber provides powerful performance, ideal for those needing a robust handgun for defense, hunting, and competitions. With a long slide and barrel, it offers enhanced accuracy and velocity over standard models.

Glock has built a reputation for reliability and innovation. The Glock 40 carries on this tradition with features like a modular optic system, which allows users to attach reflex or red dot sights easily. This versatility makes it appealing for many shooters, from law enforcement to sports enthusiasts.

The design includes a reversible magazine catch and a modular back strap, enabling a customized fit. It also features Glock’s Rough Texture grip for secure handling. For those looking to customize further, the Glock 40 supports various accessories and modifications, making it a suitable platform for personal adjustments.

Key Takeaways

  • Glock 40 offers powerful 10mm Auto caliber for defense and hunting.
  • Features include a modular optic system and customizable grips.
  • Reliable and versatile, it is suitable for various shooters.

Overview of Glock 40

The Glock 40 is a powerful and versatile 10mm pistol known for its extended barrel and enhanced accuracy. It's designed to deliver excellent performance for shooting sports, hunting, and self-defense.

History and Development

The Glock 40 emerged as part of Glock's effort to provide a robust yet manageable handgun chambered for the 10mm Auto cartridge. This model was developed to offer higher velocity and energy than other calibers. Introduced with the growing demand for a reliable, high-power sidearm, the Glock 40 filled a niche in competitive shooting and hunting communities. Glock's innovative use of polymer materials in the frame reduced weight while retaining durability, setting new standards in handgun design.

Design Philosophy

The Glock 40 features a Modular Optic System (MOS), allowing users to mount electronic sights for improved target acquisition easily. It incorporates a long slide and barrel, extending to 8.9 inches. This design minimizes recoil and boosts accuracy. The polymer frame contributes to a light build without sacrificing strength. Additional design elements include a customizable grip with interchangeable back straps enhancing ergonomics for various hand sizes. These features prioritize functional adaptability and user comfort.

Technical Specifications

  • Caliber: 10mm Auto
  • Capacity: 15 rounds
  • Weight: 28.15 oz (without magazine)
  • Length: 8.9 inches
  • Barrel Length: 6.02 inches
  • Width: 1.34 inches
  • Height: 5.47 inches

The Glock 40 boasts a 6.02-inch barrel, which improves bullet velocity and striking power. Its high magazine capacity of 15 rounds provides ample firepower. Its relatively low weight for its size allows for better handling. The width and height dimensions contribute to its balanced form, making it suitable for various shooting applications.


The Glock 40 Gen4 MOS is designed for enhanced performance and customization. Key features include an advanced Modular Optic System (MOS), ergonomic design, and a high magazine capacity.

Modular Optic System (MOS)

The Glock 40 Gen4 MOS includes a Modular Optic System (MOS) that allows easy attachment of optics. This system supports various red dot and reflex sights, providing enhanced aiming precision. Multiple adapter plates enable compatibility with popular optics brands, making it versatile for all users.

Its Picatinny rail offers additional options for mounting other accessories. This optic system improves target acquisition, making the Glock 40 Gen4 MOS suitable for hunting and target shooting. Whether new to using optics or experienced, this system is user-friendly and significantly enhances shooting accuracy.

Ergonomic Design

The Glock 40 Gen4 MOS features an ergonomic design that prioritizes comfort and adaptability. Its Modular Back Strap design allows shooters to customize the grip size, fitting various hand sizes for optimal control. This adaptability ensures a secure grip, reducing recoil impact.

A reversible magazine catch accommodates left- and right-handed shooters. This design makes usage more convenient and ensures smooth magazine changes. Additionally, the pistol’s textured grip and finger grooves provide a firm, non-slip hold, enhancing accuracy and handling under different conditions.

High Magazine Capacity

The Glock 40 Gen4 MOS boasts a high magazine capacity, holding 15 rounds of 10mm Auto ammunition. This high capacity reduces the need for frequent reloading, making it ideal for extended shooting sessions and self-defense scenarios.

Its lightweight polymer magazines contribute to the overall balance of the firearm. Even when fully loaded, the pistol remains manageable and comfortable to handle. This blend of high capacity and user-friendly design makes the Glock 40 Gen4 MOS a practical choice for various shooting activities, ensuring reliability and performance in demanding situations.

Ammunition and Calibers

The Glock 40 is primarily chambered in 10mm Auto, making it a popular choice for those needing a powerful handgun. Understanding the various calibers and how 10mm compares to others can help potential buyers make an informed decision.

10mm Auto

The Glock 40 uses the 10mm Auto, known for its high velocity and stopping power. Compared to other handgun rounds, the 10mm offers significant energy on target, which makes it favored for self-defense and hunting. It is also effective against more giant games due to its deep penetration capabilities.

Ammunition types for the 10mm range from full metal jacket (FMJ) for practice to jacketed hollow point (JHP) for self-defense. The weight can vary between 135 to 200 grains, giving shooters various options based on their needs.

Comparison With Other Calibers

When compared to the .40 S&W, the 10mm Auto typically has higher muzzle energy and velocity. The .40 S&W is more common and widely accepted in police forces, but it lacks the power of the 10mm.

Compared to the 9mm, the 10mm is significantly more powerful but has more recoil. The 9mm is praised for its manageable recoil and higher capacity magazines, making it a popular choice among casual shooters and law enforcement.

In contrast to the .45 ACP, the 10mm tends to have a flatter trajectory and higher velocity, whereas the .45 ACP offers slower, heavier bullets with a larger diameter. Both have their strengths but cater to different preferences and uses.


The Glock 40 is known for its strong shooting performance and reliable operation. It provides notable accuracy, manageable recoil, and enduring durability.

Accuracy and Velocity

The Glock 40 utilizes a 10mm Auto cartridge known for its high velocity, often reaching speeds around 1,300 feet per second (fps). This results in impressive stopping power and accuracy.

The long slide helps stabilize the shot and improve precision. Shooters often note that the Glock 40 maintains a tight grouping at various distances.

Effective trigger control, supported by GLOCK's Safe Action System and possible performance trigger upgrades, enhances shootability. Optics-ready choices, like the MOS (Modular Optic System), further elevate accuracy by allowing the attachment of red dot sights.

Recoil and Handling

The Glock 40's design effectively manages the powerful 10mm recoil. The long slide and balanced weight distribution reduce muzzle flip, making it easier to stay on target during rapid fire.

A firm grip and proper stance are essential for optimal handling. Ergonomically designed grips and finger grooves aid in better control.

Though the 10mm round generates more recoil than milder calibers, many users find it manageable with practice. It might take some adjustment time for those accustomed to shooting lighter rounds.

Reliability and Durability

Glock pistols are famous for their reliability, and the Glock 40 is no exception. It performs well in various conditions, including extreme temperatures and adverse environments.

The polymer frame resists corrosion and wear, contributing to the weapon's long lifespan. The internal parts, like the barrel and trigger components, are designed for sustained performance and minimal maintenance.

Routine cleaning and proper care ensure the Glock 40 continues running smoothly over thousands of rounds. This durability makes it a favorite among civilian shooters and law enforcement professionals.

Usage Scenarios

The Glock 40 is a versatile handgun known for its powerful 10mm round and robust design. It is famous for various uses, including law enforcement duties, hunting, and sports shooting competitions.

Law Enforcement Applications

Law enforcement agencies sometimes choose the Glock 40 for its power and reliability. The 10mm round offers significant stopping power, crucial in high-risk situations. Officers appreciate the pistol's manageable recoil, even with such a potent cartridge.

The gun's long barrel provides consistent accuracy, an essential feature for police work. However, its size and weight can make it less ideal for concealed carry or daily wear. Some agencies may issue it as a secondary weapon for specialized units due to its performance in critical scenarios.

Hunting and Outdoor Use

For hunting, the Glock 40's 10mm round delivers impressive performance and is often used for medium-sized game. The pistol's accuracy and power make it practical for hunters needing a reliable and portable firearm.

Its durable construction can withstand harsh outdoor conditions, from wetlands to rugged landscapes. Hunters also appreciate the extended barrel length for better aim and increased velocity. Though not universally favored, the Glock 40 has carved out a niche among those seeking a versatile sidearm for wilderness expeditions.

Sport Shooting and Competition

In sport shooting and competition, the Glock 40 excels due to its long barrel and high velocity. The 6-inch barrel provides a longer sight radius, aiding shooters in achieving precise shots. The 10mm round's power and ballistics are advantageous in competitive scenarios where performance and accuracy are paramount.

Sport shooters value the Glock 40's design for its balance and ease of handling during rapid fire. Its size might be a limitation in certain competitive classes, but the Glock 40 remains a strong contender for events prioritizing power and precision.

Variants and Related Models

The Glock 40 Gen4 is versatile and fits various shooting needs. Here, we'll discuss its specifics and see how it compares to related Glock models.

Glock 40 Gen4

The Glock 40 Gen4 in MOS (Modular Optic System) configuration is chambered in 10mm Auto. This model, with its longer slide and barrel, enhances velocity and balances power and accuracy.

It also features an adjustable back strap and a reversible magazine catch to comfortably fit different hand sizes. The standard capacity is 15 rounds. This variant is especially popular for hunting and tactical uses due to its higher power and reliability.

Other Glock Models

Glock offers several models in different calibers, each tailored for specific needs:

  • Glock 22: A full-size .40 caliber pistol widely used by law enforcement.
  • Glock 20: A powerful 10mm Auto variant, ideal for those needing stopping power.
  • Glock 29: A subcompact version of the Glock 20, great for concealed carry.
  • Glock 30: Compact and chambered in .45 ACP, known for its balance of power and size.
  • Glock 23: A compact .40 caliber model, blending size and stopping power.
  • Glock 41: A .45 ACP model with a more extended slide, enhancing accuracy and control.

Each model has unique features, making Glock's lineup suitable for various applications, from personal defense to professional use.

Ownership Considerations

Potential owners need to understand legal restrictions and maintenance requirements when considering owning a Glock 40. These factors are crucial for responsible gun ownership.

Legal Restrictions

Gun regulations vary widely by state and locality. In California, for instance, there are strict rules on handgun ownership. Prospective owners must navigate these rules, including mandatory background checks, waiting periods, and possible limitations on magazine capacity.

It’s essential to research your state’s laws to ensure compliance. Some areas might have bans on certain calibers or models, affecting your ability to own a Glock 40. Always verify if the Glock 40 is on your state's approved handgun roster.

Ignoring legal requirements can lead to severe consequences, including fines or imprisonment. Owners should know all local, state, and federal regulations to avoid legal issues.

Maintenance Requirements

Maintaining a Glock 40 involves several vital tasks to ensure reliability and longevity. Regular cleaning is essential, especially after shooting sessions. Owners should focus on the barrel, slide, and internal parts.

Glocks are known for their durability, but they require proper care. Cleaning supplies should include solvent, lubricant, and brushes. Lead buildup in the barrel should be checked frequently to avoid accuracy loss or damage.

Routine checks for wear and tear, especially on the recoil spring and firing pin, are vital. A detailed inspection and possible parts replacement may be necessary every few thousand rounds.

By staying on top of these maintenance tasks, Glock 40 owners can ensure their firearm stays in peak condition for years.

Accessories and Customization

The Glock 40 offers numerous customization options to enhance performance, aesthetics, and personal fit. From sights and optics to grips and backstraps and magazines and extensions, owners can make the Glock 40 truly theirs.

Sights and Optics

Sights and optics are fundamental for improving accuracy and target acquisition. The Glock 40 can use traditional iron sights, which are simple and reliable. For more advanced options, Trijicon RMR reflex sights are famous. These provide a red dot that helps with quicker target acquisition. Adding an optic can significantly improve shooting accuracy, especially in competitive or tactical shooting.

Grips and Backstraps

Grips and backstraps can be customized for a better fit and comfort. The Glock 40 has interchangeable backstraps that allow users to adjust the grip size. This customization enhances control and accuracy, making shooting more comfortable for different hand sizes. Custom grips can also provide better textures, improving the shooter’s hold and reducing slippage during firing.

Magazines and Extensions

Magazines and extensions can boost the Glock 40's capacity and handling. Extended magazines increase the number of rounds, which is essential for defensive or competitive use. Some extensions also help grip ergonomics, offering a better handle during rapid firing. High-quality magazines and base plate extensions ensure reliability and smooth feeding, which are critical during high-stress situations.

Consumer Information

The Glock 40 is valued for its high performance and adaptability balance, making it a competitive option for consumers interested in semi-automatic pistols. Understanding purchasing options and market prices can help potential buyers make an informed decision.

Purchasing Options

The Glock 40 can be purchased through various channels, both online and in physical stores. Online options include popular firearms retailers such as and GrabAGun. These websites often provide detailed product descriptions, customer reviews, and price comparisons.

Physical stores, gun shops, and sporting goods stores usually carry the Glock 40. Buyers can visit these locations to get a feel for the pistol, benefiting those who prefer in-hand inspection before purchasing.

Authorized Glock dealers are also reliable sources, often offering additional services such as warranty registration and maintenance support. Ensuring the purchase is made from authorized dealers is crucial to avoid counterfeit products and ensure the weapon comes with the manufacturer’s warranty.

Market Price and Availability

The retail price of the Glock 40 varies based on factors like dealer pricing and demand. The MSRP (Manufacturer's Suggested Retail Price) for the G40 Gen4 in MOS configuration is approximately $840. However, prices can fluctuate, especially with added features or accessories.

Market availability can differ by location and over time. Demand for the Glock 40 can impact its availability, with high demand often leading to quick sell-outs in both online and brick-and-mortar stores.

Online retailers like and GrabAGun may offer the Glock 40 at competitive prices, sometimes accompanied by promotions or discounts. Checking multiple sources can help buyers find the best deal. In-store availability can be confirmed by calling or visiting the store’s website for inventory updates.

Troubleshooting and Support

The Glock 40 is a reliable firearm, but like any mechanical device, it can experience issues. This section addresses common malfunctions and details customer service options.

Common Malfunctions

Glock 40 users may encounter trigger reset problems, failure to feed, and aiming inaccuracies. Trigger reset problems often require thorough cleaning and lubrication, and dirt and debris in the trigger assembly can cause malfunction.

Inspect the trigger components for wear, damage, or burrs. Worn-out parts should be replaced to ensure smooth operation. Failure to feed is another common problem. This can result from improper ammunition or a dirty magazine. Cleaning the gun and using quality ammo can resolve this.

Aiming inaccuracies, such as shooting to the left or low, can be frustrating. This can be due to the shooter’s technique or needing to adjust the sights. Trying different types of ammunition or grains can also help correct this issue, as different bullets interact differently with the gun's mechanics.

Customer Service

If issues persist, reaching out to Glock’s customer service is advisable. Glock provides detailed support through their official website and authorized dealers. They offer warranties for their firearms, which can cover necessary repairs.

Glock’s website has a troubleshooting guide and frequently asked questions (FAQs). These resources can help solve minor issues without needing to send the gun in for repair. For more severe problems, their email and phone support are available to guide owners through the process.

Many users find Glock’s customer support to be responsive and helpful. This can be especially useful when dealing with complex malfunctions requiring expert advice or repairs.

Looking Ahead

The Glock 40 is set to benefit from ongoing industry trends and technological advancements. These two factors are paving the way for future enhancements in performance and functionality.

Industry Trends

The firearm industry is moving towards more specialized and versatile weapons. A growing demand for pistols can serve multiple roles, from self-defense to sport shooting. Law enforcement agencies continue to prefer reliable and durable firearms, and the Glock 40 is a strong contender in this category due to its solid performance.

Additionally, there has been a trend towards modular pistols. This allows users to customize elements like grips, sights, and barrel lengths. Glock's modular approach appeals to a broad range of users and ensures their products remain relevant in an evolving market.

Technological Advancements

Technological advancements are improving the performance and user experience of the Glock 40. Enhanced materials, such as advanced polymers, make the gun lighter while maintaining durability. Moreover, enhanced manufacturing processes ensure tighter tolerances, which boosts accuracy and reliability.

Glock is incorporating more sophisticated optics and sighting system in line with these advancementss. The Glock 40 MOS model supports red dot sights, enhancing target acquisition and precision. Advances in recoil management systems are also making powerful calibers easier to handle, as evidenced by the dual recoil spring assembly in the Glock 40, which helps manage muzzle flips and felt recoil.

Frequently Asked Questions

This section addresses common questions about the Glock 40, including its differences with other models, user feedback, and performance issues.

What are the main differences between a Glock 40 and a Glock 20?

The Glock 40 has a longer 6.02-inch barrel compared to the Glock 20's 4.6-inch barrel.

The Glock 40 is designed for hunting and competition shooting, while the Glock 20 is more suited for self-defense.

Can you compare the Glock 40 and the Glock 45 in terms of performance?

The Glock 40 features a more extended slide and barrel, enhancing accuracy for long-range shooting.

The Glock 45, on the other hand, offers a compact design suitable for concealed carry and self-defense.

What are some common issues reported with the Glock 40 pistol?

Common issues include Failure to Feed (FTF) and occasional malfunctions linked to specific ammunition types.

How does the .40 caliber round compare to a 9mm in terms of power and recoil?

The .40 caliber round generally offers more stopping power than the 9mm.

However, it also produces more recoil, affecting shooting comfort and accuracy for some users.

What has been the general user feedback on the Glock 40 Gen 5?

Users appreciate the reliability and improved ergonomics of the Glock 40 Gen 5.

There are mixed opinions about the increased recoil due to its powerful caliber.

What are the specifications for barrel length on the Glock 40?

The Glock 40 features a barrel length of 6.02 inches.

This length contributes to its accuracy and suitability for hunting and long-range shooting.

Back to blog