Other Details Manufacturer: ROST MARTIN Manufacturer Part Number: RM1CBLKOSP15SPL Action: Double Action Only Barrel Length: 4" Caliber/Gauge: 9mm Capacity: 15 + 1 Frame Finish: Black Grip Material: Interchangeable Backstrap Safety: Trigger/Firing Pin/Integral Locking System Slide Description: Serrated w/Optic