The Brownells Pistol Barrel for Sig P320/M17 in 9mm is a serious upgrade for shooters who want to run a suppressor on one of the most popular modular duty and duty-inspired pistols on the market. Built in the USA from 416-R stainless steel and stress-relieved from the solid bar, this threaded barrel gives your P320 genuine suppressor compatibility without compromise. Whether you're running a P320 full-size, M17 military variant, or any compatible P320 frame, a quality barrel swap is one of the smartest first mods you can make—and Brownells' domestic manufacture and rifle work mean you're getting a part built to real standards, not just a generic import.

The engineering here is straightforward and thoughtful. A 1:10 twist rate pairs with conventional land-and-groove rifling for reliable bullet stability and easy cleaning compared to polygonal designs. The 11-degree target crown protects the rifling and supports accuracy from cold bore to follow-up shots. All thread work is cut to 1/2x28 TPI, the industry standard for 9mm suppressors and muzzle devices. The Nitride treatment on the exterior guards against corrosion and handling wear—important if you're using this barrel hard on the range, in training, or in the field.

One thing to know upfront: this barrel ships without thread protectors, so budget for a cover or cap if you want to store it capped. Also note it does not work with frames equipped with LCI (Load Chamber Indicator). If you're building a suppressor-ready P320 or upgrading an existing one, this is the kind of part that justifies the swap.

The Brownells Pistol Barrel for Sig P320/M17 in 9mm is a serious upgrade for shooters who want to run a suppressor on one of the most popular modular duty and duty-inspired pistols on the market. Built in the USA from 416-R stainless steel and stress-relieved from the solid bar, this threaded barrel gives your P320 genuine suppressor compatibility without compromise. Whether you're running a P320 full-size, M17 military variant, or any compatible P320 frame, a quality barrel swap is one of the smartest first mods you can make—and Brownells' domestic manufacture and rifle work mean you're getting a part built to real standards, not just a generic import.

The engineering here is straightforward and thoughtful. A 1:10 twist rate pairs with conventional land-and-groove rifling for reliable bullet stability and easy cleaning compared to polygonal designs. The 11-degree target crown protects the rifling and supports accuracy from cold bore to follow-up shots. All thread work is cut to 1/2x28 TPI, the industry standard for 9mm suppressors and muzzle devices. The Nitride treatment on the exterior guards against corrosion and handling wear—important if you're using this barrel hard on the range, in training, or in the field.

One thing to know upfront: this barrel ships without thread protectors, so budget for a cover or cap if you want to store it capped. Also note it does not work with frames equipped with LCI (Load Chamber Indicator). If you're building a suppressor-ready P320 or upgrading an existing one, this is the kind of part that justifies the swap.