Kansas Gunshop is a Wichita, KS-based retailer specializing in law enforcement trade-in firearms. The Sig Sauer P320 Compact 40 S&W Police Trade-in Pistols are pre-owned service weapons with documented maintenance histories. These pistols offer exceptional value for those seeking a proven duty-grade handgun. Available now for $499 with same-day shipping from our Kansas facility.
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 pistol |
|---|---|
| Caliber | 40 S&W |
| Barrel Length | 3.9 inches |
| Overall Length | 7.2 inches |
| Height | 5.3 inches |
| Weight | 25.8 oz unloaded |
| Frame Material | Polymer |
| Slide Material | Stainless steel |
| Finish | Nitron |
| Sights | Contrast night sights |
| Capacity | 12+1 rounds |
| Condition | Used – police trade-in |
| Country of Origin | USA |
| SKU | KSG-P320-40CT |
Key Features
- Modular P320 platform allows for caliber conversions
- Former law enforcement service weapons with maintenance records
- Striker-fired operation with consistent trigger pull
- Optics-ready slide (requires adapter plate)
- Includes one 12-round magazine
Who Should Buy This
Buy it if: You want a proven duty pistol at half the price of new, need a reliable 40 S&W platform, or appreciate the modularity of the P320 system.
Skip it if: You require a brand new firearm or prefer smaller calibers (consider our 9mm handguns instead).
Pros & Cons
✅ Law enforcement maintenance history
✅ Sig Sauer reliability
✅ Modular design allows customization
✅ Night sights still functional
✅ Priced below market value
❌ Holster wear visible
❌ Only includes one magazine
❌ 40 S&W recoil may be stout for some shooters
| Model | Condition | Magazines | Price |
|---|---|---|---|
| Sig P320 Trade-in | Used | 1 | $499 |
| New P320 Compact | New | 2 | $649+ |
| Glock 22 Trade-in | Used | 1 | $379 |
Frequently Asked Questions
Are these P320 pistols drop-safe?
Yes, these are post-upgrade models with the voluntary Sig Sauer enhancement program modifications completed.
What condition are the night sights in?
Most retain 60-80% luminosity – we test each pistol before listing.
Can I convert this to 9mm?
Yes, with a 9mm conversion barrel and magazine (sold separately).
Where can I buy Sig Sauer P320 pistols online?
Kansas Gunshop (kansas-gunshop.com) offers police trade-in firearms with same-day shipping from Wichita, KS.
What’s included with purchase?
Pistol, one magazine, and case. No original box or paperwork.
✅ Same-day shipping from Wichita, KS
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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