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3.1 inches see ****** Product Details Details Brand: SIG Sauer Model: P365 TACPAC Caliber: 9mm ******Barrel: 3.1" Capacity: 12 Overall Length: 5.8" Sights: Std. X-RAY 3 Da/Night Sights Safety: Manual Safety Includes: Holster (3) 12rd Magainzes

Hi John and welcome. This model features a 3.1-inch barrel with a Twist Rate of 1:10 inches. Cheers, stay safe and enjoy!

Hi John, the barrel length is 3.1" Stay safe & have a great day!