Description
Anyone who carries a Bersa Thunder 40 Ultra Compact knows how much a good spare magazine matters. This is a genuine Bersa factory magazine, not a clone or a generic aftermarket stand-in, so it drops right into your Ultra Compact Pro or Mini Firestorm 40 and runs like it was born there. It holds 10 rounds of .40 S&W and gives you a reliable backup for the range bag, the nightstand, or wherever you keep your carry gear ready to go.
What Makes This Thunder 40 Ultra Compact Magazine Different
This isn't a mag built to a generic spec sheet. Bersa manufactures it with the same materials, tolerances, and processes used on the original magazine that shipped with your pistol, which means the fit and function match what you already trust. The body is steel with a matte black finish that resists corrosion and holds up to daily carry and cleaning without showing much wear. A polymer follower keeps rounds aligned properly as they feed, and the whole thing is built to keep your pistol running the way it's supposed to.
Details That Actually Matter On A Bersa Magazine
The baseplate is polymer and removable, so field stripping the magazine for a cleaning or a spring check takes just a few seconds. There's also a molded-in finger rest that blends into the grip frame instead of sticking out awkwardly, giving you a little extra purchase without turning your compact pistol into something bulky. One thing worth knowing going in: like most new factory magazines, the spring is stiff out of the box. Load it a few times and it'll loosen up and seat rounds more easily.
Whether you're replacing a magazine that's finally given out after years of use or just want a second one loaded and ready, this is the same magazine Bersa builds for the Thunder 40 Ultra Compact line, so there's no guesswork about fit.
Key Specifications
- Manufacturer: Bersa (Talon Armament)
- Manufacturer Part Number: THUN40UCMMAG
- UPC: 810083204284
- Caliber: .40 S&W
- Capacity: 10 Rounds
- Fits Models: Bersa Thunder 40 Ultra Compact, Ultra Compact Pro, Mini Firestorm 40
- Body Material: Steel
- Finish: Matte Black / Blued
- Follower Material: Polymer
- Baseplate Material: Polymer, removable
- Finger Rest: Yes
- Overall Length: 7.5 inches
What’s Included
- 1 Bersa Thunder 40 Ultra Compact 10-round factory magazine (.40 S&W)
Frequently Asked Questions
Will this magazine fit my Bersa Thunder 40 Ultra Compact Pro or Firestorm Mini 40?
Yes. This magazine is built for the Thunder 40 Ultra Compact family, which covers the standard Ultra Compact, the Ultra Compact Pro, and the Mini Firestorm 40. They all use the same magazine well and feed lip design, so this one drops right in.
Is this a genuine Bersa magazine or an aftermarket copy?
This is a factory original Bersa magazine, manufactured to the same specs and tolerances as the one that came with your pistol. That matters for a compact .40 S&W gun since fit and spring tension directly affect feeding reliability.
Why does the magazine feel so stiff when I try to load it?
New factory magazines from Bersa tend to have a stiff spring right out of the package, which makes loading the last couple rounds tougher than expected. This isn't a defect, it just needs a break-in period. Loading and unloading it a few times will loosen it up.
Does this magazine have a finger rest for extra grip?
Yes, it has a built-in finger rest on the polymer baseplate that blends into the grip frame. It gives you a bit more surface area to hold onto without adding real bulk to what's otherwise a compact carry-friendly magazine.




Reviews
There are no reviews yet.