FNH USA has introduced its FN FNS Combination kit that allows officers to convert a pistol between 9mm and .40 S&W calibers.
The kit, which is available in either 9mm or .40 S&W, includes a slide, barrel, spring, and magazine. Users can convers an FNS 9 to a .40 S&W or an FNS 40 to a 9mm.