Rost Martin(R) RM1FBLKOSP is a full size Semi-Auto pistol chambered in 9mm Luger with a 4.5 in. black match grade barrel and a 19+1 maximum capacity. This RM1F configuration features a black Nitron optic ready serrated steel slide a black polymer frame with a Picatinny rail and interchangeable backstrap grips for a customizable fit. It supports RMR footprint optics and includes both 17 round and 19 round magazines with ambidextrous controls.Key Features9mm Luger chambering4.5 in. black match grade barrelOptic ready serrated slideRMR footprint compatiblePolymer frame with Picatinny railInterchangeable backstrap grip systemAmbidextrous controlsIncludes 17 rd. and 19 rd. magazinesRost Martin(R) focuses on producing modern defensive firearms that combine reliability ergonomic design and practical performance features. The company emphasizes user-focused engineering with optics-ready platforms and adaptable controls. Rost Martin pistols are built to provide dependable operation for personal defense and range training applications.