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-L R2 has a new Osprey Defense slim piston system. The new piston system automatically adjusts for suppressed or unsuppressed use, no adjustments needed! This pairs perfect for use with the 20" 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.