This blued alloy steel, 17-round, 9mm Luger Genuine Ruger(R) Factory Magazine is compatible with the Security-9(R) pistol. It is also compatible with the PC Carbine(TM) and PC Charger(TM) with the SR9/S9 magazine well insert installed. This magazine comes with a flush-fit floorplate installed and an adapter in the box for use in the standard Security-9. Not recommended for use with the Security-9 Compact. It is not compatible with the SR9(R) or SR9c(R) pistol. This Genuine Ruger(R) Factory Accessory is made in the USA. | Ruger Magazine 17 Round Ext Security 9