Upgrade your Compact Sig Sauer Barrel P320 / M18 9mm 3.9″ Black Nitride barrel engineered for dependable service and improved performance. This full-spec 3.9″ barrel is chambered in 9×19mm, features a 1:16 twist rate for stable bullet flight, and is finished with a hard black nitride surface treatment to reduce friction, resist corrosion, and deliver a low-glare tactical appearance.

Designed as a direct drop-in replacement for compact P320 and M18 slides, the barrel is machined to tight tolerances for consistent accuracy and smooth cycling. The 4150 chrome-moly core offers excellent strength and durability while the black nitride finish extends service life and eases maintenance. Ideal for carry, duty, and range use, this barrel gives compact Sig owners a cost-effective, match-capable upgrade.

Warning: This product can expose you to chemicals, including lead, which is known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.

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