Franklin Armory proudly presents the world's first piston driven rimfire platform. Chambered in the amazing .17 Winchester Super Magnum it provides a cleaner and flatter shooting solution for all kinds of pest control. The F17-X R2 has a new Osprey Defense slim piston system. The piston system automatically adjusts for suppressed or unsuppressed use no adjustments needed! This pairs perfect for use with the 16" barrel which is threaded in the common A 1/2-28 thread pitch perfect for use with compatible suppressors. The new proprietary handguard features an integrated barrier stop / indexing point and is M-Lok compatible.Specifications: Barrel Length: 16" Threaded A 1/2-28 Thread pitch Handguard/Upper: 15" Integrated Barrier Stop Sights: Optic Ready Twist: 1:9 Charging Handle: Standard Bolt Carrier: F17 Proprietary Lower: FAI Trigger: Custom Tuned Trigger Gas System: OPS Piston Gas Block: Low Profile Muzzle Device: Aura Color: Black Stock: B5 Systems Bravo Grip: B5 Type 23 P-Grip Caliber: .17 WSM