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This is the factory original 18-round magazine for Sig Sauer full-size P320 and P250 pistols chambered in .40 S&W or .357 Sig. Built with carbon steel construction and a corrosion-resistant finish, the magazine delivers the durability you need for range sessions or defensive use.
The anti-tilt polymer follower keeps rounds feeding straight and smoothly through the mag well, while the high-tensile steel spring maintains consistent pressure across the entire load. A polymer baseplate sits flush with full-size grip modules and handles impacts without cracking, plus it removes easily for cleaning and maintenance.
Fresh out of the box, these magazines can feel stiff. Most people need to download them by a couple rounds for the first couple weeks of use. Once they're loaded and sitting for a bit, the spring settles in and they'll accept full capacity without any problems. It's normal and nothing to worry about.
The 18-round capacity in .40 S&W and .357 Sig gives you solid firepower whether you're at the range or relying on the pistol for serious work. Since the P320 platform shares magazines across P250 and P320 full-size models, this mag works across the entire family. The black finish blends with factory Sig finishes, keeping everything looking cohesive.
This magazine is designed for full-size P320 and P250 grip frames. While a full-size 18-round magazine may function in compact frames, it will extend below the grip, which isn't ideal for carry. Compact models need compact-sized magazines for proper fit and handling. Always verify compatibility with your specific grip module.
.357 Sig and .40 S&W use the same magazine bodies in the P320 platform because they share identical external dimensions. This magazine works with both calibers, so you can load it with either .40 S&W or .357 Sig rounds depending on what you're shooting that day.
Fresh Sig magazines often have a stiff spring that needs a brief break-in period. Load it down by a couple rounds for the first week or two while it settles, then you can load it to full capacity. This is completely normal and the magazine will work perfectly once the spring relaxes slightly.
Yes, the P320 X-Five is built on the full-size P320 platform and shares the same magazine design. This 18-round magazine will work with the X-Five along with all other full-size P320 and P250 models.
| UPC | 798681561018 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MAG-MOD-F-43-18 |
| Brand Fit | Sig Sauer |
| Caliber/Gauge | .357 Sig |
| Capacity | 18 |
| Color | Black |
| Model | |
| Model Fit | P320 |
| Product Type | Magazine |
| Quantity | 1 |
| Shipping Weight | 0.36 |
| Length | 10 |
| Package Height | 2.0 |
| Package Width | 4.5 |
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