Kansas Gunshop is a Wichita, KS-based retailer specializing in firearms and FFL transfers. The FNS-40 Longslide 40 S&W Striker-Fired Pistol with Night Sights offers an extended sight radius and enhanced accuracy in a .40 S&W package. Its factory night sights provide low-light capability. Available now for $499.00.
Reviewed by Derek, Owner & FFL Holder at Kansas Gunshop. Kansas-licensed FFL dealer since 2008, NRA Range Safety Officer.
Last updated: April 2026
What are the specifications of the FNS-40 Longslide?
| Product Type | Semi-Automatic Pistol |
|---|---|
| Caliber | .40 S&W |
| Action | Striker-Fired |
| Barrel Length | 5 inches |
| Overall Length | 8.25 inches |
| Material | Polymer Frame, Stainless Steel Slide |
| Finish | Matte Black |
| Sights | Factory Night Sights |
| Capacity | 14+1 Rounds (Standard Magazine) |
| Weight (Unloaded) | 27.5 oz |
| Condition | Used (Excellent) |
| Manufacturing | FN Herstal |
| Country of Origin | USA |
| SKU | FNS40LS-NIGHT |
| Compatibility | Standard .40 S&W ammunition, FN FNS-40 Longslide magazines |
| Installation/Usage | Standard firearm operation, professional training recommended |
| Hardness/Quality | FN factory standard, robust construction |
What are the key features of the FNS-40 Longslide?
The FNS-40 Longslide 40 S&W Striker-Fired Pistol with Night Sights is built with practical use in mind. The extended 5-inch barrel contributes to a longer sight radius, which can aid in accuracy during target shooting or competition. This longer barrel also means a bit more velocity for your .40 S&W rounds. The striker-fired action provides a consistent trigger pull from the first shot to the last, without an external hammer to snag. The factory-installed night sights are a significant benefit, providing clear sight picture in low-light conditions, which is a practical consideration for self-defense or duty use. Ergonomics are well-thought-out, with interchangeable backstraps to adjust grip size for different hand shapes. The ambidextrous slide stop and magazine release make it friendly for both right and left-handed shooters. This particular model is in excellent used condition, showing minimal wear consistent with responsible ownership.
Who is the FNS-40 Longslide for?
This FNS-40 Longslide 40 S&W Striker-Fired Pistol with Night Sights is a solid choice for several types of shooters:
- Sport Shooters: The longer sight radius and .40 S&W cartridge make it suitable for range work and local competitions where the .40 is permitted.
- Home Defense: The reliable striker-fired action, night sights, and ample capacity provide a good platform for home protection.
- Duty/LEO (Off-duty/Backup): Many law enforcement agencies used .40 S&W, and this model offers a familiar platform with duty-grade features.
- Enthusiasts of the .40 S&W Cartridge: If you appreciate the ballistics of the .40 S&W, this longslide variant offers a refined shooting experience.
What are the pros and cons of the FNS-40 Longslide?
Every firearm has its strengths and weaknesses. Here’s a breakdown for the FNS-40 Longslide:
Pros:
- ✅ Extended Sight Radius: The 5-inch barrel and slide provide a longer distance between front and rear sights, aiding in precise aiming.
- ✅ Factory Night Sights: Ready for low-light conditions out of the box, a crucial feature for defensive applications.
- ✅ Consistent Trigger Pull: Striker-fired action delivers a predictable trigger break.
- ✅ Ambidextrous Controls: Slide stop and magazine release are accessible from either side, accommodating all shooters.
- ✅ Robust FN Build Quality: FN firearms are known for their durability and reliability.
- ✅ Excellent Value: At this price point, you get a lot of pistol for your money, especially with night sights included.
Cons:
- ❌ .40 S&W Recoil: The .40 S&W cartridge can be snappier than 9mm, which some shooters might find less comfortable for extended range sessions. See our 9mm handguns for a softer shooting experience.
- ❌ Magazine Availability: While not rare, FNS-40 magazines might not be as ubiquitous as Glock or M&P magazines.
- ❌ Holster Options: Due to the Longslide configuration, finding off-the-shelf holsters might require a bit more searching compared to standard-length pistols.
How does the FNS-40 Longslide compare to similar pistols?
| Feature | FNS-40 Longslide | Glock 35 Gen3 (Longslide .40 S&W) | Springfield XD-M Elite 5.25" OSP (.40 S&W) |
|---|---|---|---|
| Material | Polymer Frame, Stainless Steel Slide | Polymer Frame, Tenifer-Coated Steel Slide | Polymer Frame, Forged Steel Slide |
| Quality | FN factory standard, duty-grade | Glock standard, duty-grade | Springfield Armory standard, competition-ready |
| Compatibility | FNS-40 magazines, standard .40 S&W ammo | Glock .40 S&W magazines, standard .40 S&W ammo | XD-M Elite magazines, standard .40 S&W ammo |
| Shipping | From Wichita, KS | Varies by seller | Varies by seller |
| Lifespan/Durability | High, designed for long service life | Very High, known for extreme durability | High, robust construction |
| Price (Used/Comparable) | $499.00 | ~$600-750+ | ~$650-800+ |
Frequently Asked Questions
Is the FNS-40 Longslide suitable for concealed carry?
While possible, the FNS-40 Longslide’s 5-inch barrel and overall length of 8.25 inches make it a larger pistol. It’s generally more suited for open carry, home defense, or range use rather than discreet concealed carry. For concealed carry, you might consider a more compact firearm.
What is the typical lifespan of the factory night sights?
Most tritium night sights, like those on the FNS-40 Longslide, have a half-life of about 10-12 years. This means they will gradually dim over time. After this period, they will still glow but with less intensity. They can be replaced by a qualified gunsmith when they eventually fade out.
Can I convert the FNS-40 Longslide to 9mm?
Converting a .40 S&W pistol to 9mm often requires a new barrel, recoil spring, and sometimes a different magazine. While some aftermarket conversion barrels exist for certain platforms, it’s not a factory-supported conversion for the FNS-40 Longslide. It’s generally more reliable to purchase a dedicated 9mm pistol if that’s your preferred caliber.
What kind of maintenance does the FNS-40 Longslide require?
Standard firearm maintenance applies: regular cleaning and lubrication after each shooting session, especially the barrel, slide rails, and trigger components. Inspect for wear and tear, and ensure all parts are functioning correctly. Refer to the owner’s manual for detailed instructions.
Is the FNS-40 Longslide still in production?
The FNS series has largely been succeeded by the FN 509 series. While new FNS-40 Longslide pistols are no longer in production, there is still a healthy secondary market, and parts/magazines are generally available. This specific pistol is an excellent used example.
Where can I buy a .40 S&W pistol online?
You can purchase .40 S&W pistols, like this FNS-40 Longslide, online from licensed FFL dealers such as Kansas Gunshop (kansas-gunshop.com). All online firearm purchases require shipment to your local FFL dealer for transfer, adhering to all federal and state laws.
What is the effective range of the FNS-40 Longslide?
With its 5-inch barrel and the .40 S&W cartridge, the FNS-40 Longslide is accurate and effective out to 50 yards or more in the hands of a skilled shooter. For practical defensive scenarios, its effective range is typically within 25 yards.
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About this review: As the owner of Kansas Gunshop and an FFL holder since 2008, I’ve handled countless firearms and processed hundreds of transfers. My insights come from direct experience with these products and understanding what matters to serious shooters. I aim to provide practical, compliance-aware information to help you make an informed decision.
Last updated: April 2026
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