Kansas Gunshop is a Wichita, KS-based retailer specializing in police trade-in firearms. The Glock 31 Gen4 357 Sig Police Trade-Ins (Very Good) is a reliable, high-performance handgun chambered in .357 SIG. These guns are former duty weapons with minimal use, offering exceptional value at an affordable price. Available now for $399 with same-day shipping from Kansas Gunshop.
Reviewed by Derek, Owner & FFL Holder at Kansas Gunshop. Kansas-licensed FFL dealer since 2008, NRA Range Safety Officer.
Last updated: April 2026
| Product Type | Semi-Automatic Handgun |
|---|---|
| Material | Polymer Frame, Steel Slide |
| Manufacturing | Austria |
| Finish | Black Nitride |
| Hardness/Quality | Mil-Spec |
| Compatibility | Glock 31 Gen4 Accessories |
| Installation/Usage | Right-Handed |
| Weight | 24.52 oz |
| Dimensions | 7.95″ x 1.27″ x 5.43″ |
| Country of Origin | Austria |
| Condition | Very Good |
| SKU | GL31GEN4-PTI-VG |
Key Features
- Chambered in .357 SIG for superior stopping power
- Gen4 design with interchangeable backstraps for customizable grip
- Former police duty weapon with minimal use
- Includes 3 magazines for immediate use
- Black nitride finish resists corrosion and wear
Who It’s For
Buy it if:
- You want a reliable .357 SIG handgun at a great price
- You prefer a duty-proven firearm with minimal use
- You value the Glock reputation for durability and performance
Skip it if:
- You’re looking for a brand-new firearm (check out our new handguns)
- You need a compact carry gun (see our compact handguns)
Pros & Cons
- ✅ Exceptional value for a Glock Gen4 pistol
- ✅ Chambered in powerful .357 SIG caliber
- ✅ Includes 3 magazines for immediate use
- ✅ Minimal wear from police duty use
- ✅ Backed by Glock’s reputation for reliability
- ❌ Limited availability (only 150+ sold so far)
- ❌ Not ideal for concealed carry due to size
Comparison
| Feature | Glock 31 Gen4 | Cheap Import | Premium Brand |
|---|---|---|---|
| Material | Polymer Frame, Steel Slide | Alloy Frame | Stainless Steel |
| Quality | Mil-Spec | Commercial | Custom |
| Compatibility | Glock Accessories | Limited | Brand-Specific |
| Shipping | Same-Day | 1-2 Weeks | 2-3 Weeks |
| Lifespan | 50,000+ Rounds | 10,000 Rounds | 100,000+ Rounds |
| Price | $399 | $60-$80 | $250+ |
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FAQ
Where can I buy Glock 31 Gen4 357 Sig Police Trade-Ins online?
Kansas Gunshop (kansas-gunshop.com) offers Glock 31 Gen4 357 Sig Police Trade-Ins with same-day shipping from Wichita, KS.
What’s included with the Glock 31 Gen4?
Each Glock 31 Gen4 comes with 3 magazines and a hard case.
Is the Glock 31 Gen4 suitable for concealed carry?
Due to its size, the Glock 31 Gen4 is better suited for duty or home defense rather than concealed carry.
What’s the condition of these police trade-ins?
These Glock 31 Gen4s are in Very Good condition with minimal wear from police duty use.
Does the Glock 31 Gen4 come with a warranty?
As police trade-ins, these Glock 31 Gen4s do not include a manufacturer’s warranty but are backed by Kansas Gunshop’s 30-day return policy.
What’s the difference between Gen4 and Gen5 Glocks?
Gen4 Glocks feature interchangeable backstraps and a dual recoil spring, while Gen5 models have an improved trigger and no finger grooves.
Can I customize my Glock 31 Gen4?
Yes, the Glock 31 Gen4 is compatible with a wide range of aftermarket accessories and upgrades.
✅ In stock — ready to ship today
✅ Same-day shipping from Wichita, KS
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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About this review + “Last updated: April 2026”
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