The Tisas PX-9 20-round magazine is engineered for reliable use with Tisas PX-9 Duty, Duty Threaded, and Tactical Threaded GEN 1-3 9mm pistols. It also fits the PX-9 Carry model, though it will not seat flush with the grip. This magazine is designed to be compatible with SIG Sauer P226 pistols for added convenience. Compatible with PX-9 Duty, Duty Threaded, Gen 1-3 pistols Also fits SIG Sauer P226 models 20-round capacity This PX-9 magazine is a dependable option for those wanting additional rounds or a versatile spare compatible across platforms.