The Vanquish 22 integrally suppressed barrel. With zero baffles and a ported barrel design it ensures incredible sound suppression simplified maintenance and seamless integration with the Ruger 10/22. Specifications: CALIBER: 22 Long Rifle CHAMBER: Bentz (Match chamber for semi-autos. Tighter than the factory sporter chamber) PLATFORM: Ruger 10/22 Standard Rifle RIFLING: Button rifled TWIST RATE: 1-16a ^2 BARREL: 18.5a ^2 precision ported Shaw barrel in 416R stainless steel SHROUD/SUPPRESSOR BODY: 6061 aluminum with a Cerakote finish CONTOUR (DIAMETER): 0.920a ^2 bull WEIGHT: 1.3lbs COUNTRY OF MANUFACTURE: Made in Charlotte NC USA