The Franklin Armory Fa F17-x 16 Upper Kit 17wsm 10rd is a complete upper receiver solution designed to install smoothly on your Milspec AR lower, delivering a clean, flat-shooting option chambered in .17 Winchester Super Magnum for pest control and precision shooting alike. This piston-driven upper features the new Osprey Defense slim piston system that automatically adjusts for suppressed or unsuppressed use with no adjustments required, pairing perfectly with the 16 inch barrel threaded to -28 to accommodate compatible suppressors. The uppers proprietary F17 bolt carrier and OPS gas piston deliver reliable performance, while the low-profile gas block, muzzle device Aura, and a 1:9 twist rate support stable handling and accuracy. A modern handguard with integrated barrier stop and indexing point is M-Lok compatible, and the upper is optics-ready with a standard charging handle. Its black finish and compact profile make it a versatile addition to your AR platform, enabling efficient pest control with a clean, consistent shot discipline in a ready-to-install package.