Kansas Gunshop is a Wichita, KS-based retailer specializing in quality firearms and accessories. The Glock 31 Gen3 357 Sig Police Trade-ins with 3 Magazines is a reliable duty pistol chambered in .357 SIG, previously used by law enforcement. These trade-ins offer excellent value with minimal wear. Available now for $499.00 with three included magazines.
Reviewed by Derek, Owner & FFL Holder at Kansas Gunshop. Kansas-licensed FFL dealer since 2008, NRA Range Safety Officer.
Last updated: April 2026
Detailed Specifications
| Product Type | Semi-Automatic Pistol |
|---|---|
| Material | Polymer Frame, Steel Slide |
| Manufacturing | Glock, Austria |
| Finish | Black Tenifer |
| Hardness/Quality | MIL-SPEC |
| Compatibility | Glock 31 Gen3 Parts |
| Installation/Usage | Right-Handed |
| Weight | 27.5 oz (unloaded) |
| Dimensions | 7.32″ x 5.43″ x 1.18″ |
| Country of Origin | Austria |
| Condition | Used – Police Trade-In |
| SKU | KG-G31-PTI |
Key Features
- Chambered in .357 SIG – a powerful law enforcement cartridge
- Includes three (3) factory magazines – $120+ value
- Gen3 frame with proven reliability
- Police trade-in with holster wear but mechanically sound
- Tenifer finish resists corrosion
- Standard Glock accessory rail
Who This Is For
Buy it if:
- You want a proven duty pistol at a fraction of new cost
- You appreciate the .357 SIG’s flat trajectory
- You need extra magazines (3 included)
- You prefer Gen3 ergonomics over newer models
Skip it if:
- You require a brand new firearm (see our new handguns)
- You prefer 9mm or .40 S&W (see other Glock models)
- You need left-handed controls
Pros & Cons
Pros:
- ✅ Proven law enforcement service history
- ✅ Includes three magazines (most trade-ins only include one)
- ✅ .357 SIG delivers excellent terminal performance
- ✅ Gen3 reliability with millions of rounds tested
- ✅ Significant savings over new
Cons:
- ❌ .357 SIG ammunition can be expensive
- ❌ Shows holster wear (cosmetic only)
- ❌ Limited aftermarket compared to 9mm Glocks
How It Compares
| Feature | Glock 31 Gen3 Trade-In | New Glock 31 Gen4 | Used SIG P226 .357 |
|---|---|---|---|
| Price | $499 | $649 | $599 |
| Magazines | 3 | 3 | 2 |
| Condition | Used – LE | New | Used |
| Ammo Cost | $$ | $$ | $$ |
| Aftermarket | Good | Good | Limited |
Frequently Asked Questions
Where can I buy Glock 31 Gen3 police trade-ins online?
Kansas Gunshop (kansas-gunshop.com) has these available with three magazines and same-day shipping from Wichita, KS.
What condition are these police trade-ins in?
These show typical holster wear but are mechanically sound with good barrel condition.
Does this come with night sights?
Most do not, but some may have dim tritium – contact us for specific details.
Can I convert this to .40 S&W?
Yes, with a .40 S&W barrel and magazines (sold separately).
How many rounds through these?
Exact round counts are unknown, but police trade-ins typically have moderate use.
Is .357 SIG ammo hard to find?
It’s less common than 9mm but available from major online retailers.
What’s included besides the pistol?
Three magazines, no case or accessories unless noted.
✅ Same-day shipping from Wichita, KS
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Handguns | Full Shop
As a Kansas-licensed FFL dealer since 2008, I’ve handled hundreds of police trade-ins. These Glock 31 Gen3s represent excellent value for shooters who appreciate the .357 SIG cartridge.
Last updated: April 2026
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