Mesko (Zakłady Metalowe Mesko S.A.) is a Polish defense industry enterprise located in Skarżysko-Kamienna. The company is part of the state-owned defense group Polska Grupa Zbrojeniowa (PGZ). Its primary specialization is the production of ammunition of various calibers and missile weaponry, as well as the disposal and modernization of military equipment. The company manufactures man-portable air-defense systems (MANPADS) alongside a wide range of NATO-standard small arms ammunition as well as medium- and large-caliber artillery and tank shells.