Fostech Drone Predator 9mm Threaded Pistol Barrel w/ Protector 1-10 Twist 1/2x28in Gold 3.9in. These Predator Barrels redefine expectations with a 416R stainless steel construction and single-point cut rifling featuring our innovative SPT (Single Point Cut with SPT Technology) from Killer Innovations ensuring an optimal 1:10 twist rate. The addition of an 11deg target crown further enhances accuracy making these barrels the epitome of reliability and precision Specifications for Fostech Drone Predator 9mm Threaded Pistol Barrel w/ Protector: Manufacturer: Fostech Barrel Twist Rate: 1-10 Package Contents: Fostech Drone Predator 9mm Threaded Pistol Barrel w/ Protector Fostech 10940GL9: Drone Predator 9mm Threaded Pistol Barrel w/ Protector 1-10 Twist 1/2x28in Gold 3.9in