Description

Looking for a lightweight, high-capacity magazine that feeds the increasingly popular 5.7x28mm cartridge reliably? The KELTEC PR57 is a purpose-built, 20-round magazine designed specifically for the unique demands of the 5.7 round, offering a blend of modern polymer construction and Kel-Tec’s innovative engineering.

Why This Magazine Stands Out

Californiagunshop is a San Antonio, TX-based retailer specializing in firearms and tactical gear for families and responsible shooters. The KELTEC PR57 is a 20-round polymer magazine chambered in 5.7x28mm. It’s engineered from the ground up for the P50 pistol, ensuring optimal feed geometry and reliability. Available now for $407.99 with same-day shipping.

Having handled countless magazines over the years, from standard GI issue to custom competition builds, I appreciate when a company designs a magazine specifically for its firearm. The 5.7x28mm round is a unique beast—it’s long, bottlenecked, and operates at high pressure. You can’t just adapt a 9mm magazine design and hope for the best. Kel-Tec built the PR57 alongside the P50, which means the feed lips, follower, and spring tension are all tuned for that specific cartridge. This is the kind of attention to detail that prevents malfunctions, something I always stress when teaching new shooters about gear reliability.

Detailed Specifications

How It Stacks Up: A Real-World Comparison

Feature	KELTEC PR57 (This Product)	Generic/Aftermarket 5.7 Mag	FN Herstal Five-seveN® Magazine
Material & Build	Proprietary polymer, steel feed lips & spring.	Often lower-grade polymer, questionable metal.	High-quality polymer, steel components.
Quality & Fit	OEM part. Perfect fit for P50, no wobble.	Fit can be loose, may require filing.	OEM for FN pistol, not compatible with P50.
Compatibility	Kel-Tec P50 only.	May claim “universal” 5.7 fit (rarely true).	FN Five-seveN® & PS90 only.
Shipping & Availability	In stock, ships today from TX.	Long lead times, often from overseas.	Often on backorder, higher demand.
Lifespan & Durability	Designed for high-round counts. Reliable feed.	Springs fatigue quickly, feed lips crack.	Proven durability in duty use.
Price Point	$407.99 (for a 2-pack of magazines)	~$40-60 each (you get what you pay for).	~$50-70 each (for FN platform).

Note: The listed price is for a package containing two (2) KELTEC PR57 magazines.

Pros and Cons: My Honest Take

What I like:

• ✅ OEM Reliability: Factory-made for the P50. This is the magazine the gun was tested with, so you know it works.
• ✅ High-Capacity Design: 20 rounds of 5.7x28mm in a relatively compact package gives the P50 serious firepower.
• ✅ Lightweight Polymer: Keeps overall weight down, which is a big plus for all-day shooting or introducing new shooters to the platform.
• ✅ Durable Construction: The polymer feels robust in hand, and the steel reinforcement where it counts inspires confidence.
• ✅ Optimal Feed Geometry: Designed specifically for the 5.7 cartridge, which is critical for smooth, consistent feeding.

Points to consider:

• ❌ Platform-Specific: This magazine is only for the Kel-Tec P50. It will not work in an FN Five-seveN or other 5.7 platforms. If you need magazines for other firearms, check out our Handguns section.
• ❌ Price Perception: At first glance, the price might seem high, but remember this is for a two-pack of genuine OEM magazines, which is the standard way these are sold.

Who Should (and Shouldn’t) Buy This

Buy it if:

• You own a Kel-Tec P50 and want factory-original, reliable spare magazines.
• You value OEM parts for guaranteed compatibility and performance.
• You’re building out your P50 setup for competition or training and need multiple mags.
• You’re a new P50 owner looking for the most trusted magazine option.

Skip it if:

• You own a different 5.7x28mm firearm (like an FN). You’ll need a different magazine.
• You’re looking for a single magazine; this is sold as a two-pack.
• Your budget only allows for the absolute lowest-cost option, accepting potential reliability trade-offs.

Common Concerns & Questions

“Is it really worth getting the OEM magazine?”
In my experience as an armorer, yes. With a cartridge as finicky as the 5.7x28mm, feed reliability is paramount. The PR57 is part of the P50’s operating system. Aftermarket options often have subtle differences in angle or spring tension that can lead to failures. For a defensive or primary firearm, stick with factory.

“How does it handle with a full 20 rounds?”
The polymer construction keeps it surprisingly light even when fully loaded. The length does make the P50 a large-handled pistol, but the balance remains good. I recommend practicing reloads to get used to the mag’s size—something I cover with all my students.

Frequently Asked Questions

If you’re running a Kel-Tec P50, having a supply of factory magazines is non-negotiable for reliable performance. This two-pack gives you a solid start. From my time on the range, both for fun and in competitive settings, knowing your gear works every time lets you focus on the fundamentals.

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