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SIG SAUER® P320™ Caliber X-CHANGE Kit - Full Size, 9mm, Black, 17rd Magazine

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All the parts you need to fully convert your P320.

The P320 modular fire control unit allows for you to easily change your frame, magazine, slide, barrel, and caliber all in one -- you just need the right parts. This X-CHANGE kit provides all the parts required to do just that.

This P320 X-CHANGE kit is configured for full-size, 9mm functionality. It includes a 17-round magazine, barrel, frame, magazine, and pre-assembled slide with factory iron sights installed.

X-CHANGE Kit: Not a Firearm

The P320's fire control unit is the serialized, legal-by-definition firearm component. All other components, including the parts in Sig Sauer X-CHANGE kits, are not firearms and cannot function without a fire control unit. This kit does not require an FFL transfer to purchase, and it ships directly to your front door.


WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to:

Shipping Restrictions

Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or "assault weapons" (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily. only ships within the United States. Federal legislation dictates we cannot ship our products internationally.


We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.