Description
This is the genuine factory magazine for the Sig Sauer P320-XTEN chambered in 10mm Auto. It holds 15 rounds and comes built from the manufacturer's specifications to ensure proper fit and function in your P320-XTEN.
Construction Built for 10mm Power
The magazine body is made from heat-treated carbon steel and coated for enhanced lubricity, which helps it stay slick and functional through heavy use. A high-impact polymer floorplate absorbs shock from drops and keeps the rounds secure. The nitride coating on the steel provides solid corrosion resistance, so the magazine will hold up to regular range time and outdoor conditions without breaking down.
Design Features That Matter
This P320-XTEN magazine includes factory-drilled witness holes on the rear so you can count rounds at a glance while shooting. The high-tensile steel spring and anti-tilt polymer follower work together to keep 10mm cartridges properly aligned as they feed into the chamber, which is important with a round that produces this much energy. The build quality is consistent across units because these come straight from Sig's factory rather than third-party manufacturers.
Full-Size Fit
This magazine is designed specifically for the full-size P320-XTEN configuration. It won't fit 9mm P320 platforms or AXG grip modules, so make sure you've got the right platform before ordering. If you're running the XTEN, this is the magazine that works with your gun.
Key Specifications
- Manufacturer: Sig Sauer
- Model: P320-XTEN
- Caliber: 10mm Auto
- Capacity: 15 Rounds
- Material: Heat-Treated Carbon Steel with Nitride Coating
- Floorplate: High-Impact Polymer
- Spring Type: High-Tensile Steel
- Follower: Anti-Tilt Polymer
- Finish: Black
- Magazine Length: 9.5 inches
- Fit: Full-Size P320-XTEN only
- Manufacturer Part Number: 8900743
- UPC: 798681657063
What’s Included
- One 15-round magazine for P320-XTEN 10mm
Frequently Asked Questions
Will this P320-XTEN magazine work with my 9mm P320?
No, this magazine is specifically designed for the full-size P320-XTEN in 10mm and won't fit 9mm P320 platforms or AXG grip modules. The 10mm cartridge requires a different magazine body, spring, and follower setup. Make sure you have the XTEN before ordering.
Is this magazine suitable for carry or just range use?
This is a factory OEM magazine built to Sig's standards for both range and carry use. However, like any magazine, proper maintenance and testing with your specific ammo is smart practice. Some users report that fully loaded 15-round magazines can require a firm push to seat properly due to the compact external design of the XTEN, so test it before relying on it for defensive purposes.
How durable is the polymer floorplate?
The high-impact polymer floorplate is designed to withstand drops and regular use without cracking. The nitride-coated steel body handles the pressures from 10mm rounds reliably. Field reports show these magazines hold up well to frequent loading and unloading at the range.
Can I see how many rounds are loaded without opening the magazine?
Yes, this magazine has factory-drilled witness holes on the rear. You can look through these numbered holes to get a quick visual count of how many rounds are loaded, which is handy when you're on the range or in the field.






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