Description
If you run a Smith and Wesson 5900 series pistol, you already know what reliability means. This Mec-Gar magazine keeps that same level of performance feeding into your gun. Made in Italy by a manufacturer that supplies OEM magazines to some of the biggest names in firearms, this 15-rounder brings serious engineering to a simple job.
The build is straightforward and effective. You get a heat-treated carbon steel tube that handles years of loading and unloading without warping or deforming. Inside, a high-tensile music wire spring maintains consistent pressure to feed rounds smoothly every time. The polymer follower and removable butt-plate are durable components that won't let you down. Side-facing witness holes let you count your rounds at a glance without breaking out the mag from your belt.
Performance With the 5900, 659, and 910
This magazine fits the full 5900 family along with the 659, 910, and 915 models. The 15-round capacity matches factory specifications and gives you a balanced profile whether you're at the range, running practice drills, or carrying as a spare. New mags sometimes have stiffer springs that take a few loads to break in smoothly, but that's normal and nothing to worry about. The tolerances are tight and precise, which is exactly what you want from a magazine that's going to cycle thousands of rounds through your pistol.
Why Mec-Gar
Since 1965, Mec-Gar has built magazines for military and law enforcement around the world. That's not marketing talk. That's the reason Browning, SIG Sauer, Remington, and Walther all have Mec-Gar build OEM magazines under their brand names. You're not getting some aftermarket knockoff here. You're getting the same quality and attention to detail that goes into factory magazines, just marked with the Mec-Gar name and at a better price point. The build quality is solid enough that many users report these mags function just as well as or better than factory replacements.
Key Specifications
- Manufacturer: Mec-Gar
- Manufacturer Part Number: MGSW5915B
- UPC: 765595440111
- Caliber: 9mm
- Capacity: 15 rounds
- Magazine Type: Detachable
- Finish: Blued
- Tube Material: Heat-treated carbon steel
- Spring Type: High-tensile music wire
- Follower Material: Polymer
- Baseplate: Removable polymer
- Compatible Pistols: S&W 5900 series, 659, 910, 915, 5903, 5904, 5906, 5923, 5924, 5926, 5943, 5944, 5946
- Overall Length: 9.3 inches
- Country of Origin: Italy
What’s Included
- One 15-round Mec-Gar 9mm magazine
Frequently Asked Questions
Will this Mec-Gar magazine work in my S&W 659 or 910?
Yes. This magazine is designed to fit the full Smith and Wesson 59 series lineup, including the 659, 910, 915, and all 5900 series variants. Mec-Gar engineered this magazine to match factory specifications for these models, so fit and function are dialed in.
Why is the spring so stiff when the magazine is new?
New magazines come with fresh springs that are manufactured to tight tolerances. The stiffness will ease out after a few dozen loads and unloads. This is normal and expected. It's also a good sign that your spring will hold tension reliably for years of shooting.
How does Mec-Gar compare to factory Smith and Wesson magazines?
Mec-Gar is actually the OEM supplier for factory magazines for Smith and Wesson and many other manufacturers. These magazines are built to the same exacting standards as factory mags but are marked with the Mec-Gar name. Many users find them to be just as good as or better than the originals, and they cost significantly less.
Can I use the numbered witness holes to check my round count?
Absolutely. The witness holes on the side of the magazine make it easy to see how many rounds you have loaded without pulling the magazine out to look. This is helpful for running the same load during training sessions or understanding capacity when working with different firearm configurations.






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