KelTec KP50 5.7x28mm Pistol

Ever find yourself wishing your range day had a little more capacity and a lot more fun factor? You’re not alone. After years of seeing folks come through our shop looking for something different—something that breaks the mold of the standard polymer-frame 9mm—I’ve developed a real appreciation for firearms that bring genuine innovation to the table. That’s exactly what we’re looking at with the KelTec KP50 5.7x28mm pistol.

Imbertsmithersarms is a Grand Forks, ND-based retailer specializing in practical firearms for hunters, shooters, and the concealed carry lifestyle. The KelTec KP50 5.7x28mm pistol is a high-capacity, blowback-operated handgun chambered in the flat-shooting 5.7x28mm cartridge. Its defining feature is the dual 50-round FN P90 magazines that feed from the grip, offering unmatched firepower in a pistol platform. Available now for $699.00 with fast, discreet shipping from our North Dakota warehouse.

Why the KelTec KP50 5.7x28mm Pistol Stands Out

Let’s be honest: the handgun market can feel repetitive. The KelTec KP50 is a breath of fresh air. It takes the proven, low-recoil 5.7x28mm round—famous from the FN Five-seveN and PS90—and packages it in a way that’s both wildly practical for certain uses and an absolute blast on the range. The twin 50-round magazines aren’t just a gimmick; they represent a serious amount of time between reloads, whether you’re on the firing line or considering it for certain types of pest control or varmint hunting where volume matters. For the budget-conscious shooter who wants maximum capacity without stepping into NFA territory, the KP50 makes a compelling argument.

KelTec KP50 5.7x28mm Pistol Specifications

How Does the KelTec KP50 Stack Up?

When you’re looking at a 5.7x28mm pistol, you generally have two other routes: the original FN Five-seveN or a conversion kit for another platform. Here’s a straightforward breakdown.

Feature	KelTec KP50	FN Five-seveN MRD	Ruger-57
Material & Build	Polymer frame, steel barrel. Functional, budget-focused.	Premium polymer & steel. Military heritage.	Polymer frame, stainless slide. Rugged reliability.
Quality & Feel	Utilitarian. It’s built for a specific purpose.	Refined fit and finish. Top-tier.	Excellent ergonomics, great trigger out of the box.
Compatibility	FN P90 Mags (50-rd). Unique system.	Proprietary FN 57 Mags (20-rd).	Proprietary Ruger Mags (20-rd).
Shipping	✅ Same-day from ND	Varies by retailer	Varies by retailer
Lifespan/Durability	Designed for high round count. Simple blowback action.	Battle-proven, extremely durable.	Ruger’s reputation for longevity.
Price	$699.00	~$1,300+	~$750-$800

The KP50 wins on pure capacity per dollar. You’re getting 100 rounds on tap (with both mags) for hundreds less than the FN. The Ruger-57 is closer in price but offers a more traditional handgun experience with half the magazine capacity.

Honest Pros and Cons of the KelTec KP50

After handling this piece, here’s my straight-shooting assessment:

Pros:

• ✅ Unmatched Capacity: Two 50-round magazines give you 100+1 rounds ready to go. For sustained fire on the range or specific field applications, this is a huge advantage.
• ✅ Low Recoil Platform: The 5.7x28mm round is inherently low-recoil, and the KP50’s blowback operation and weight make it exceptionally soft-shooting.
• ✅ Ready for Optics & Lights: The integrated Picatinny rail on top and bottom means adding a red dot and a weapon light is simple.
• ✅ Ambidextrous Controls: The safety and magazine release work from either side, a great feature for left-handed shooters.
• ✅ Threaded Barrel: Comes standard with a 1/2×28 threaded barrel, ready for a muzzle device or suppressor (with proper paperwork).
• ✅ Budget-Friendly 5.7x28mm Entry: It brings the 5.7x28mm cartridge to a much more accessible price point.

Cons:

• ❌ Bulkier than Traditional Pistols: The dual-magazine grip is wide. This isn’t a concealed carry piece. If you need a daily carry gun, check out our concealed carry handguns.
• ❌ Magazines are Proprietary (to the P90): While they are standard FN magazines, they are a specific type. Spares are available but are an additional cost.
• ❌ Utilitarian Aesthetics: Let’s call it “function-first.” It won’t win beauty contests, but it’s built for a job.

Who Should (and Shouldn’t) Buy the KelTec KP50

Buy the KelTec KP50 5.7x28mm pistol if:

• You’re a recreational shooter who values high capacity and low recoil for extended range sessions.
• You’re involved in varmint or predator control where a high volume of flat-shooting rounds is beneficial.
• You’re a fan of unique, innovative firearm designs and the 5.7x28mm cartridge.
• You want a capable, optics-ready pistol for home defense that holds a massive amount of ammunition.
• You’re looking for the most cost-effective way to get into a high-capacity 5.7x28mm platform.

Skip the KelTec KP50 and consider an alternative if:

• You need a concealed carry weapon. Its size makes it impractical. Look at our subcompact pistols instead.
• You prioritize a sleek, traditional pistol ergonomic above all else. The Ruger-57 or FN Five-seveN will suit you better.
• You’re on an extremely tight ammunition budget. While 5.7x28mm is more available than ever, it’s still more expensive per round than 9mm.

Common Questions & Concerns

“Is the blowback operation reliable with the 5.7x28mm?” KelTec’s design uses a fixed barrel and a simple, heavy blowback system. It’s proven to be reliable with a wide range of 5.7x28mm ammunition. The cartridge’s low recoil impulse is well-suited to this type of operation.

“How difficult is it to load the 50-round magazines?” They require a specific technique, and a magazine loader is highly recommended. We suggest picking up a P90 magazine loader to save your thumbs.

“Can it be fired with just one magazine inserted?” Yes. The firearm will function normally with only the left or right magazine inserted. You don’t have to run both at all times.

Frequently Asked Questions

Ready for a different kind of range day? The KelTec KP50 5.7x28mm pistol delivers an experience you won’t get from anything else in its price range. It’s a conversation starter, a high-capacity workhorse, and a testament to practical innovation. At $699.00, it represents a significant value in the 5.7x28mm world.

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