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Upgrade your P320 with a quality, custom barrel.

The P320 can provide arguably the greatest "bang for the buck" (literally) when it comes to investing in an upgrade-able performance pistol platform: Thanks to its universal chassis and largely tool-less design, the exoskeleton, slide, barrel, and caliber can be swapped altogether and with ease. That's why we're sourcing quality, match-grade custom P320 barrels for your pistol.

OEM and Aftermarket P320 Barrels

Not interested in breaking the bank? Simply want to swap calibers on your Sig P320? Grab an affordable OEM barrel guaranteed to fit like a glove with MOA accuracy, like Sig Sauer intended. All OEM and aftermarket barrels made from quality, mil-spec 4150V carbon steel or 416R Crucible stainless -- the same stainless alloy used to forge and cut the world's best competition rifle barrels.

Heat-treated with QPQ Nitride

Available carbon steel barrels are heat-treated after forging to obtain a Mohs hardness of RC 43-47, greatly increasing barrel life and protecting the rifling from deformation, especially during rapid fire. Carbon barrels are further protected against erosion, heat, rust and fatigue thanks to a high-temperature QPQ Nitride treatment, providing a slick black finish that blends in and provides a diamond-tough coating.


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DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

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.