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This is the factory Sig magazine that comes standard with the P365-FUSE model. A 21-round magazine for your P365 platform means you're looking at serious capacity without needing a completely different gun. The steel body is treated with anti-friction coating to withstand the kind of regular use that comes with range trips and training.
The magazine holds 21 rounds of 9mm in a steel construction that's designed to last. Inside, an anti-tilt polymer follower paired with a high-quality steel spring keeps your rounds properly aligned and feeding smoothly. That reliability matters whether you're at the range, training for competition, or practicing your draw. The extended black baseplate gives you a better grip on the magazine itself when you're loading or performing a reload under pressure.
Rear-facing numbered witness holes let you count your rounds at a glance without having to unload the magazine. The bright orange follower makes it immediately obvious when the magazine is empty, which is useful for clearing your gun and doing a quick inventory of what you've got loaded. These are small details that add up to better handling and faster operation when you need it.
This magazine works with every 9mm P365 model including the standard P365, P365X, P365XL, P365-XMACRO, AXG-LEGION, P365-FUSE, and the newer DH3 and FLUX variants. Just know that while it functions in all of them, the extended baseplate is designed to sit flush with the P365-XMACRO and FUSE grip modules. On smaller grip frames like the standard P365 and P365X, there will be a visible gap at the bottom, which is normal and doesn't affect function.
Yes, it's fully compatible with every 9mm P365 model. However, because the extended baseplate is designed for the larger X-MACRO grip module, you'll see a gap when you install it on the smaller P365X or P365XL frames. It functions perfectly fine—the gap is just aesthetic. If you don't like how it looks, Sig makes interchangeable baseplates for different grip sizes, and aftermarket options are available too.
Factory Sig magazines typically have a firm break-in period. Expect the spring to be quite stiff out of the box, especially when loading a full 21 rounds. This is normal and actually a good sign—tight springs maintain consistent feeding. After 100-200 rounds of use, they loosen up and become easier to load while still functioning reliably.
Yes. The P365-XMACRO is designed around a 17-round standard capacity, but this 21-round magazine is a factory option for the platform. Some users carry it, though the added length and weight compared to the 17-rounder is worth considering based on your holster and carry position. It pairs well with the X-MACRO's extended grip module.
The bright orange follower lets you instantly see when the magazine is empty without having to remove it from your gun or manually check inside. That quick visual feedback is helpful during reloads, when checking your inventory, or during dry practice. It's a small feature that improves handling.
| UPC | 798681693443 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 8901594 |
| Caliber/Gauge | 9mm |
| Capacity | 21 |
| Color | Black |
| Length | 8.5000 |
| Model | |
| Package Height | 1.8 |
| Package Width | 4.0 |
| Product Type | Accessory-Magazines |
| Quantity | 1 |
| Shipping Weight | 0.35000000000000003 |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
| Style | Extended |
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