Glock Gen 4 Explained: What Gen 4 Means + Which Models Are Worth It

What Does Gen 4 Mean?

Gen 4 is Glock's designation for the fourth generation of their pistol design, introduced in 2010. It represents a significant update from Gen 3, incorporating user feedback and modern manufacturing improvements. Gen 4 pistols were introduced in 2010 and later replaced by Gen 5 (starting in 2017 on many models).

The Gen 4 designation applies across Glock's entire lineup—models like the Glock 17, 19, 22, 23, and others all received Gen 4 updates. While specific features may vary slightly between models, the core Gen 4 improvements are consistent across the lineup.

Gen 4 is no longer in production, but it remains popular on the used market and is still a capable, reliable generation that serves well for duty, competition, and civilian use.

Key Gen 4 Features

Interchangeable Backstraps

Gen 4 pistols introduced interchangeable backstraps that allow shooters to customize grip size. Options typically include small, medium, large, and beavertail backstraps. This was a significant improvement for shooters with larger or smaller hands who couldn't get a comfortable fit with earlier generations.

RTF (Rough Textured Frame)

Gen 4 features improved grip texture called RTF (Rough Textured Frame) that's more aggressive than earlier generations. This provides excellent traction but can be rough on hands during extended shooting sessions. Some shooters love it, while others find it too abrasive.

Finger Grooves

Gen 4 retained finger grooves molded into the front strap of the grip (which also existed in Gen 3). These work well for some hand sizes but can be uncomfortable for others. The grooves became controversial and were removed in Gen 5.

Dual Recoil Spring

Gen 4 introduced a dual recoil spring assembly designed to reduce felt recoil and extend spring life. This was particularly beneficial for higher-recoil calibers like .40 S&W and .45 ACP. The dual spring system became standard in Gen 5 as well.

Larger Magazine Release

Gen 4 features a larger, reversible magazine release button that's easier to manipulate, especially for shooters with smaller hands or those who prefer to reverse it for left-handed use.

Which Gen 4 Models Are Worth It?

Gen 4 models can offer excellent value, especially on the used market. Here's a breakdown by use case and what to consider when evaluating Gen 4 models:

Best Used Value

Gen 4 pistols often represent the best value on the used market, typically selling for less than Gen 5 while offering modern features like dual recoil springs and interchangeable backstraps. Models like the Glock 19 Gen 4 and Glock 17 Gen 4 are frequently available at attractive prices. If you find a well-maintained Gen 4 at a good price and the finger grooves fit your hands, it can be an excellent value proposition.

Best for Concealed Carry

For concealed carry, the Glock 19 Gen 4 remains a top choice. The compact size, proven reliability, and dual recoil spring make it an excellent carry option. The aggressive RTF texture provides good grip, though some find it rough against skin. If finger grooves fit your hands, the Gen 4 can be preferable to Gen 5 for carry.

Best for Duty and Range Use

Full-size Gen 4 models like the Glock 17 Gen 4 excel for duty and range use. The dual recoil spring, interchangeable backstraps, and proven reliability make them solid choices. The aggressive grip texture provides excellent control during extended shooting sessions. These models are often available at good prices on the used market.

Best for .40 S&W

Gen 4 models in .40 S&W, like the Glock 22 Gen 4 and Glock 23 Gen 4, benefit significantly from the dual recoil spring system, which helps manage .40 S&W's snappy recoil. If you prefer .40 S&W and find a good deal, Gen 4 models offer excellent value and performance.

MOS vs Non-MOS Considerations

Gen 4 does not have factory MOS (Modular Optic System) versions. If you want to mount a red dot sight, you'll need aftermarket slide milling. This is an important consideration if optics capability is a priority. Gen 5 offers MOS versions that don't require milling, which may be worth the additional cost if you plan to use optics. However, if you don't need optics capability, Gen 4 offers the same reliability and performance at a lower price point.

Gen 4 vs Gen 3

Gen 4 adds interchangeable backstraps, improved grip texture (more aggressive than Gen 3), dual recoil spring, and larger reversible magazine release compared to Gen 3. Both Gen 3 and Gen 4 have finger grooves. Gen 3 is simpler and often more affordable, while Gen 4 offers more customization options and modern features.

Choose Gen 3 if you prefer simplicity and find a better deal. Choose Gen 4 if you need backstrap customization or prefer the modern features like dual recoil spring and improved grip texture.

Gen 4 vs Gen 5

Gen 5 removes finger grooves, has smoother grip texture, features ambidextrous slide stop, uses Marksman barrel, and offers MOS versions. Gen 5 is generally considered an improvement, though some prefer Gen 4 features like finger grooves or aggressive texture.

Choose Gen 4 if you find a good deal, finger grooves fit your hands, and you don't need Gen 5 features like MOS or ambidextrous controls. Choose Gen 5 if you're buying new or want the latest refinements. For a detailed comparison, see our Glock 19 Gen 4 vs Gen 5 guide.

Pros & Cons of Gen 4

Glock Gen 4 FAQ

Safety Considerations

Grip Fitment

The Gen 4's finger grooves may not fit all hand sizes comfortably. If the grooves don't align with your fingers, it can affect grip and control. Try before you buy if possible, or consider a Gen 3 or Gen 5 if finger grooves are a concern.

Magazine Compatibility

Gen 4 magazines work in Gen 5 pistols, and Gen 5 magazines generally work in Gen 4 pistols. Both have dual-side notches. The main compatibility consideration is magazine release notch orientation: if a Gen 4 reversible magazine release is set for left-handed use, some older magazines without matching notches won't lock in properly. Always test your magazines with your specific pistol for maximum reliability.

Aftermarket Parts

When installing aftermarket parts, ensure they're designed for Gen 4 specifically. Some parts are generation-specific, and using incompatible parts can affect reliability and safety. Test thoroughly after any modifications.