SIG SAUER P365 380 Auto Caliber X-Change Kit – 3.1 Inch, 10 Round

SIG SAUER P365 .380 Auto Caliber X-Change Kit

The SIG SAUER P365 .380 Auto Caliber X-Change Kit gives owners of a compatible P365 fire-control unit a factory-configured path to the compact P365-380 format. Identified by manufacturer part number 8900719, this black kit brings together the caliber-specific upper assembly, a standard P365 grip module, and a 10-round steel magazine. It is intended for users who want to add a .380 Auto configuration while retaining the familiar dimensions, controls, and modular architecture of the P365 platform.

Factory-Matched .380 Auto Configuration

The kit uses a 3.1-inch .380 Auto barrel paired with a black Nitron-finished slide. Because the barrel, slide components, grip module, and magazine are packaged for the same configuration, the buyer does not have to assemble a conversion from unrelated individual parts. The result is a coordinated P365-380 setup built around SIG SAUER components and the original P365 serialized fire-control unit.

SIGLITE sights provide a familiar three-dot sight picture with low-light capability. The compact sighting system keeps the slide streamlined for everyday handling and storage. This listing does not describe an electro-optic, threaded barrel, or extended-capacity magazine; it is the standard black 3.1-inch configuration supplied with one 10-round steel magazine.

Standard P365 Grip Module

A black standard-size P365 polymer grip module is included. It preserves the short, narrow profile associated with the original P365 while providing the correct housing for the removable fire-control unit. Textured gripping surfaces and the molded accessory area maintain the platform’s familiar handling characteristics. The included 10-round magazine fits this standard grip length and supports a compact overall package.

The modular design also makes the kit useful for owners who want one fire-control unit to support more than one P365 configuration. Once properly assembled, the user can train with the same control layout while selecting the caliber and component set appropriate for the intended range session or carry setup. Always confirm the installed configuration, magazine, and ammunition before loading.

What Is Included

• P365-380 slide assembly with black Nitron finish
• 3.1-inch barrel chambered in .380 Auto
• SIGLITE sights
• Standard black P365 grip module
• One 10-round steel magazine

Compatibility and Installation

This is a caliber-exchange kit, not a complete firearm. A compatible P365 fire-control unit is required and is not included. Product sources describe the kit as compatible with P365 models, but owners should still compare their exact host components and current SIG SAUER guidance before assembly. Follow the manufacturer’s instructions, keep the firearm unloaded during installation, and have a qualified armorer or gunsmith inspect the work if there is any question about fit, function, or safe operation.

After assembly, perform all manufacturer-recommended function checks before live fire. Use only quality .380 Auto ammunition and the correct P365-380 magazine. Do not attempt to use 9mm ammunition or a magazine intended for a different caliber in this configuration.

Why Choose the P365-380 Kit?

For an existing P365 owner, the kit offers a compact .380 Auto option without purchasing an additional serialized fire-control unit. The .380 Auto chambering can provide a softer-shooting alternative for practice or personal-defense use, while the standard grip and controls minimize the adjustment required when moving between compatible P365 configurations. The complete component set also makes it easier to keep the .380-specific parts together and clearly identified.

Exact Product Identification

This listing is for SIG SAUER part 8900719, UPC 798681655823. It includes one 10-round magazine. Magazine-capacity and component restrictions vary by jurisdiction, so verify local requirements before ordering.