This P365 Factory Sig Sauer 12 round 9mm magazine pre-installed with our MTX 365 12 to 15rd magazine extension kit gives you the ultimate 15rd extended magazine for your Sig Sauer P365! All components of the magazine except the steel magazine body are manufactured by XTech Tactical Unlike the now discontinued Sig Sauer P365 15rd magazine, our combo give you a much improved grip and control over the pistol by filling our the back of the magazine and therefore your grip. Our engineered spring with our injection molded sleeve and MTX extension give you a package you can count on regardless of your use. Our extension uses both of our issued utility patents to extend a magazine with inward facing base plate rails and eliminate any catch point when the follower transfers from the extension to the magazine body. This set up with the standard Sig 365 is ideal for back up magazines or if you live in Colorado which limits to 15rd magazines. Compatible with the standard P365 grip module, Wilson Combat standard grip module for the Sig P365, and many other standard sized modules -Will not fit the P365 X or the XL With its innovative, patented design, US 11,408,697 B2 and US 11,168,954 B1, and unparalleled reliability, this superior accessory is a must-have for any Sig Sauer P365 owner looking to enhance their firearm's performance and take their shooting skills to new heights. This listing is for a complete 15rd magazine for the P365 pistol, for extension kit only click the following link: https://www.xtechtactical.com/product/mtx-mp9-fpc-extended-mag/ WILL NOT SHIP TO CA, MD, MA, NJ, NY, DC, CT, HI, WA or INTERNATIONAL.