SIG SAUER P365-XMACRO 9mm 17-Round Magazine

SIG SAUER P365-XMACRO 17-Round Magazine

This factory SIG SAUER magazine provides a 17-round capacity for the P365-XMACRO and compatible P365-family 9mm pistols. It is identified by manufacturer part number 8900804 and UPC 798681660254. The magazine combines a steel body, black finish, polymer follower, and extended basepad in a factory-engineered assembly intended to preserve the fit and feeding geometry of the P365 platform.

Designed around the longer XMACRO grip, the magazine fits flush with the bottom of a standard P365-XMACRO grip module. Its 17-round capacity supports range sessions, training, lawful carry, and spare-magazine use without relying on an aftermarket extension. One magazine is included.

Factory Steel Construction

The magazine body is formed from steel for strength and dimensional consistency. A black finish provides a low-profile appearance and helps protect the exterior during normal handling, loading, and insertion. Side witness holes allow a quick visual reference of the loaded-round count without unloading the magazine.

Inside the body, a factory spring and polymer follower work together to present cartridges at the proper angle. The polymer basepad protects the bottom of the magazine and provides a finished interface with the grip. As with any magazine, regular inspection and responsible cleaning help keep debris, damaged feed lips, or a weakened spring from interfering with operation.

P365-Family Compatibility

Part number 8900804 is cataloged as a P365-XMACRO 9mm magazine. It is also commonly used with compatible P365, P365X, and P365XL grip configurations when the correct factory-style basepad or included adapter is used. Fit can vary when a pistol has an aftermarket grip module, magwell, or basepad, so owners should confirm compatibility with the manufacturer of those components.

When installed in a shorter P365 grip, the magazine extends below the frame. That additional length provides the increased 17-round capacity and can offer more gripping surface, but it does not convert other components or change the pistol’s slide and barrel configuration. Verify reliable lockup, feeding, and slide-stop operation with the specific unloaded firearm before live use.

Key Specifications

• Manufacturer part number: 8900804
• UPC: 798681660254
• Brand: SIG SAUER
• Primary model fit: P365-XMACRO
• Caliber: 9mm Luger
• Capacity: 17 rounds
• Body material: Steel
• Finish: Black
• Follower: Polymer
• Basepad: Extended polymer
• Witness holes: Yes
• Quantity: One magazine

Replacement or Spare Factory Magazine

This magazine is a practical choice for replacing a worn or damaged original, adding a dedicated training magazine, or carrying a factory spare. A magazine remains a critical part of a semi-automatic pistol’s feeding system, so factory dimensions and components help maintain the interface SIG intended for the P365-XMACRO.

Magazine-capacity restrictions vary by state and locality. Review the product’s listed shipping restrictions and confirm current possession rules before ordering. Load only the correct 9mm ammunition, follow the firearm owner’s manual, and discontinue use if the body, feed lips, follower, spring, or basepad shows damage.