Glock G31 Review: A Complete Breakdown of All Generations

The Glock G31, chambered in .357 SIG, is a high-velocity, full-sized handgun designed for law enforcement, self-defense, and competitive shooting. Over the years, the G31 has evolved through different generations, refining its ergonomics, reliability, and overall performance.

In this review, we’ll cover all generations of the Glock G31 (Gen 3, Gen 4, and Gen 5), comparing their features, advantages, and differences to help you determine which model suits your needs best.

Glock G31 Overview

What Makes the Glock G31 Special?

The Glock G31 stands out because of its high-velocity .357 SIG chambering, which offers:

✅ Superior Ballistics – Higher velocity and penetration than standard 9mm handguns.
✅ Reliable Performance – Glock’s proven Safe Action System ensures consistent functionality.
✅ Lightweight & Durable – Polymer frame provides excellent strength-to-weight ratio.
✅ Customizable – Compatible with Glock accessories, including lights, lasers, and optics.

Now, let’s break down each generation of the Glock G31 and see how it has evolved over time.

Glock G31 Gen 3 Review

The Glock G31 Gen 3 was one of the earliest iterations of this .357 SIG powerhouse, bringing Glock’s reputation for reliability to a high-velocity cartridge.

Key Features of the G31 Gen 3:

• Fixed Glock sights (adjustable models available).
• 15+1 round magazine capacity.
• Polymer frame with finger grooves for grip control.
• Standard Picatinny accessory rail for mounting lights/lasers.
• Tenifer-coated steel slide for corrosion resistance.

Pros:

Lightweight and durable polymer frame.
Powerful .357 SIG round for superior stopping power.
Reliable operation under extreme conditions.

Cons:

No interchangeable backstraps – Fixed grip size.
Slightly aggressive recoil compared to 9mm models.
Finger grooves may not be comfortable for all hand sizes.

📌 Best for: Shooters who want a classic Glock feel with reliable performance.

Glock G31 Gen 4 Review

The G31 Gen 4 introduced several ergonomic and functional improvements over its predecessor.

Key Upgrades in the G31 Gen 4:

• Modular Backstrap System – Adjustable grip sizes for different hand shapes.
• Reversible magazine release – Makes it easier for left-handed shooters.
• Rough Textured Frame (RTF) – Better grip control under sweaty or wet conditions.
• Dual recoil spring system – Reduces felt recoil and increases durability.

Pros:

More comfortable grip with customizable backstraps.
Reduced recoil for better follow-up shots.
Increased reliability with an improved recoil spring system.

Cons:

Slightly heavier than Gen 3 due to additional features.
Not optics-ready (no MOS version available).

📌 Best for: Shooters who want improved ergonomics, less recoil, and a more adaptable grip.

Glock G31 Gen 5 Review (Expected, but Not Yet Released)

As of now, Glock has not yet officially released a Gen 5 version of the G31, but if it follows the Gen 5 improvements seen in other models, we can expect:

🔹 No finger grooves for a cleaner grip design.
🔹 nDLC finish for a tougher, more corrosion-resistant slide.
🔹 Flared magwell for faster reloads.
🔹 Marksman barrel for enhanced accuracy.
🔹 Ambidextrous slide stop lever.

📌 Best for: If Glock releases a Gen 5 G31, it would be ideal for shooters looking for the latest innovations in Glock technology.

Glock G31 vs. Other .357 SIG Pistols

Why Choose the Glock G31?

-Lighter weight than metal-framed competitors.
-Higher capacity than SIG Sauer alternatives.
-Less expensive than other .357 SIG pistols while maintaining reliability.

Frequently Asked Questions (FAQs)

1. Is the Glock G31 good for self-defense?

Yes! The .357 SIG caliber offers greater penetration and stopping power compared to 9mm. It’s an excellent choice for self-defense, home protection, and duty carry.

2. How does the G31 compare to a Glock 17?

• The G31 fires .357 SIG, while the Glock 17 fires 9mm.
• The G31 has more power but also more recoil.
• Magazine capacities are similar (G31 holds 15+1, G17 holds 17+1).

3. What’s the best holster for the Glock G31?

Look for a full-size Glock-compatible Kydex, leather, or hybrid holster with good retention and adjustable cant.

4. Can I mount a red dot on the G31?

None of the Glock G31 generations come MOS-ready, but aftermarket optic plates and slide cuts can add red dot compatibility.

5. What ammo works best in the Glock G31?

🔹 Self-defense: Federal HST, Speer Gold Dot, Winchester Ranger T-Series.
🔹 Target Practice: Armscor, Blazer Brass, PMC Bronze.