$20.99
43 in stock
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The ProMag SMI33 is a straightforward replacement magazine for the S&W SD40 chambered in .40 S&W. This 10-rounder gets the job done whether you're stocking up on spares for the range or keeping backups for carry.
Built from high carbon heat-treated steel and TIG-welded for durability, the magazine uses a precision-wound heat-treated chrome-silicon spring that holds up well over time. The follower and baseplate are molded from DuPont Zytel polymer, designed to keep rounds feeding smoothly without fuss. The blued finish resists corrosion and gives it a solid appearance.
The magazine is sized to nestle cleanly in the SD40's magwell and holds a full 10 rounds without modification. ProMag backs every mag with a lifetime guarantee against manufacturer defects, so if something goes wrong, you can send it back for replacement. These are made in the USA, which means you're getting domestic manufacturing and support.
One important note: this magazine is engineered specifically for the SD40 standard model and won't work with the VE variant. Make sure you have the standard SD40 before ordering.
No, the SMI33 is specifically designed for the standard SD40 and won't work with the VE variant. The magazine catch and magwell design are different between these models. Make sure you have the standard SD40 before ordering.
You get the magazine itself. It comes ready to use, though new magazines sometimes have stiffer springs that can feel tight when loading initially. They break in with regular use.
Yes, ProMag backs all their magazines with a lifetime guarantee against manufacturer defects. If you experience a defect during normal use, you can contact ProMag directly for a replacement.
The SMI33 uses solid construction with heat-treated steel and proper springs, making it a reliable spare magazine option. The main appeal is cost and availability. Some people prefer factory mags for primary duty, but these work fine for range practice and backups.
Yes, the magazine is designed to lock the slide back when the last round is fired, which is standard functionality for defensive and range use.
This magazine holds 10 rounds of .40 S&W ammunition in a standard double-stack configuration.
| UPC | 708279013577 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | SMI33 |
| Brand Fit | S&W |
| Caliber/Gauge | .40 S&W |
| Capacity | 10 |
| Model | |
| Model Fit | SD |
| Product Type | Detachable |
| Shipping Weight | 0.265 |
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