Manufactured to our exacting specifications and used in all of our rifles, this JP Supermatch™ barrels is turned from 416R stainless steel, lead lapped and air-gauged. Chamber: 9mm Length: 16" Twist: 1:10 button rifled Contour: Light Muzzle Threads: 1/2"-36 TPI Material: 416R Stainless Steel Finish: Machine finish Weight: 24.7 oz.