These black oxide alloy steel 17-round 9mm Luger Genuine Ruger Factory Magazines are compatible with the Security-9 pistol and the PC Carbine with the SR9/Security-9 Magazine Well Insert installed. This magazine comes with a flush-fit floor plate installed and a polymer adapter for a clean fit in the pistol grip's magazine well. NOT RECOMMENDED FOR USE WITH THE SECURITY-9 COMPACT. NOT COMPATIBLE WITH SR-9 OR SR9c PISTOLS. This Genuine Ruger Factory Accessory is made in the USA.