Ruger SR9c Black 9mm Luger Handgun Magazine with Extended Floorplate - 10 Rounds - Blue steel, 10-Round 9mm caliber magazine for the Ruger SR9c. Comes with both flat and extended floorplates. It is compatible with the PC Carbine with the SR9 / Security-9 Magazine Well Insert installed. It is not compatible with the Security-9 pistol. Includes both flat and extended floorplates 10 rounds