Factory new pistol. Rock Island Armory STK100 9mm Luger 4.5in Black Pistol - 17+1 Rounds - Striker-fired pistol fans, rejoice. The STK100 boasts an aluminum grip that adds just enough weight to reduce felt recoil while still being comfortable to carry all day. This 9mm 17-round gem has a textured grip angled like a 1911 grip to give you greater control. With a patent-pending frame designed for durability, It has all the advantages of metal for the price of a polymer.