Glock 17 Gen 4: Specs, Differences, Best Upgrades

The Glock 17 Gen 4 is the fourth generation of Glock's original full-size 9mm pistol, introduced in 2010. It features improvements over earlier generations including interchangeable backstraps, enhanced grip texture, and a dual recoil spring assembly.

This guide covers the Gen 4's specifications, how it differs from other generations, and recommended upgrades for different applications. Whether you're considering a Gen 4, comparing it to other generations, or looking to customize one, understanding its features and upgrade options will help you make informed decisions.

People often ask about the Gen 4 because it's still widely available and offers good value, especially on the used market. Understanding its features and upgrade potential helps determine if it meets your needs.

What Is the Glock 17 Gen 4?

The Glock 17 Gen 4 is the fourth generation iteration of the original Glock pistol, introduced in 2010. It was a significant update that incorporated user feedback and modern manufacturing improvements. Gen 5 launched in 2017, and Gen 4 continued to remain widely sold and available after that.

The Gen 4 introduced several features that became standard: interchangeable backstraps for different hand sizes, improved RTF (Rough Textured Frame) grip texture, a larger reversible magazine release, and a dual recoil spring assembly. It also features finger grooves on the front strap, which became a point of contention among shooters.

While no longer in production, the Gen 4 remains popular on the used market and is still a capable, reliable pistol that serves well for duty, competition, and range use.

Specs & Key Features

Caliber: 9mm Luger
Capacity: 17 rounds (standard magazine)
Barrel Length: 4.49 inches
Overall Length: 7.95 inches (202 mm)
Height: 5.47 inches
Width: 1.26 inches (32 mm)
Weight (unloaded): 22.36 ounces
Trigger Pull: Approximately 5.5 pounds
Sights: Standard Glock polymer sights
Frame: Polymer with RTF texture, finger grooves
Backstraps: Modular Backstrap System with add-on backstraps (commonly medium/large sizes)
Recoil Spring: Dual spring assembly

Differences from Other Generations

Gen 4 vs Gen 3

The Gen 4 adds interchangeable backstraps, improved grip texture, larger magazine release, and dual recoil spring. The Gen 3 has a simpler design without these features. The Gen 4 is generally considered an improvement, though some prefer the Gen 3's simpler design.

Gen 4 vs Gen 5

The Gen 5 removes finger grooves, has smoother grip texture, features an ambidextrous slide stop, uses a Marksman barrel, and has trigger refinements. The Gen 5 is generally considered an improvement, though some prefer Gen 4 features like finger grooves.

Best Upgrades

Sights

The standard polymer sights are functional but basic. Upgrading to night sights (tritium), fiber optic, or high-visibility sights improves target acquisition and low-light performance. Popular options include Trijicon, Ameriglo, and Dawson Precision.

Trigger

While the stock trigger is reliable, many shooters upgrade to aftermarket triggers for improved feel and performance. Options range from connector changes to complete trigger systems. Popular choices include Apex Tactical, Overwatch Precision, and Zev Technologies.

Optics Mounting

If you have a non-MOS Gen 4, you'll need aftermarket slide milling (or another mounting solution) to mount a red dot sight. If you have the Gen 4 MOS model, you can mount an optic using MOS plates. Many companies offer milling services for popular optic footprints like RMR, Holosun, and others.

Magazine Extensions

Extended baseplates can increase capacity from 17 to 19-21 rounds. Popular options include Taran Tactical, Strike Industries, and Glock factory +2 extensions. Ensure reliability testing with any extensions.

Grip Enhancements

If the RTF texture is too aggressive or you want additional grip, options include grip tape, stippling services, or aftermarket grip sleeves. Some shooters prefer to reduce the texture rather than enhance it.

Barrel

Aftermarket barrels can improve accuracy, add threaded options for suppressors, or provide different finishes. Popular manufacturers include KKM Precision, Bar-Sto, and SilencerCo. Stock barrels are generally accurate enough for most applications.

Pros & Cons

Pros

• Interchangeable backstraps for fit customization
• Dual recoil spring reduces felt recoil
• Aggressive grip texture provides excellent traction
• Reversible magazine release
• Proven reliability and track record
• Often available at good prices (used market)

Cons

• Finger grooves may not fit all hand sizes
• Aggressive grip texture can be rough
• No ambidextrous slide stop
• Non-MOS models require milling for optics
• Older design (superseded by Gen 5)

Who Should (and Shouldn't) Choose It

Best For

• Those who find finger grooves comfortable
• Budget-conscious buyers finding good deals
• Those who prefer aggressive grip texture
• Right-handed shooters
• Those buying used and finding Gen 4 at good prices

Consider Gen 5 If

• Finger grooves don't fit your hands
• You're left-handed (ambidextrous slide stop)
• You want optics-ready capability (MOS)
• You want the latest refinements
• You prefer smoother grip texture

Glock 17 Gen 4 FAQ

Is the Glock 17 Gen 4 still being made?

Gen 5 launched in 2017, and Gen 4 continued to remain widely sold and available after that. Gen 4 pistols are still widely available on the used market and through some dealers.

What are the best upgrades for a Gen 4?

Common upgrades include night sights, trigger improvements, slide milling for optics, magazine extensions, and grip modifications. The best upgrades depend on your intended use—duty, competition, or range shooting have different priorities.

Can you put a red dot on a Gen 4?

Is the Gen 4 reliable?

Yes, the Gen 4 is highly reliable. It maintains Glock's reputation for reliability and has a proven track record in duty, competition, and civilian use. The differences between Gen 4 and Gen 5 are refinements rather than reliability improvements.

What's the difference between Gen 4 and Gen 5?

Key differences include: Gen 5 removed finger grooves, has smoother grip texture, features an ambidextrous slide stop, uses a Marksman barrel, and offers MOS versions for optics. The Gen 5 is generally considered an improvement, though some prefer Gen 4 features.

Is a used Gen 4 worth buying?

A used Gen 4 can be an excellent value if the price is right and it's in good condition. Glocks are known for durability, and a well-maintained Gen 4 will provide years of reliable service. Inspect any used pistol carefully and test fire if possible.

Safety Considerations

Ammunition Compatibility

The Gen 4 is designed for standard pressure 9mm Luger ammunition. It can handle +P ammunition, but frequent use may accelerate wear. Always use ammunition that meets SAAMI specifications.

Aftermarket Modifications

When installing aftermarket parts, especially triggers and internal components, ensure they're designed for the Gen 4 specifically. Mixing generations or using incompatible parts can affect reliability and safety. Test thoroughly after any modifications.

Magazine Compatibility

Gen 5 magazines are generally backward compatible with Gen 4 pistols, and Gen 4 magazines work in Gen 5 pistols. Both generations' magazines have dual-side notches. If the Gen 4 magazine release is reversed for left-handed use, you need magazines with ambi notches (Gen 4/Gen 5 style).

Bottom Line

The Glock 17 Gen 4 is a reliable, capable full-size 9mm pistol that remains a solid choice, especially if you can find it at a good price. Its interchangeable backstraps, improved grip texture, and dual recoil spring make it a good option for duty, competition, or range use.

It's worth buying if you find a good deal, the finger grooves fit your hands, and you don't need Gen 5 features like MOS or ambidextrous controls. The Gen 4 offers good value and can be upgraded to meet specific needs.

If you're buying new or want the latest improvements, the Gen 5 is generally the better choice. However, a well-maintained Gen 4 will serve you just as reliably and may offer better value depending on pricing and your specific preferences.