The ProMag® Sig Sauer® P229 .40 S&W / .357 Sig 15-Round Magazine features a precision-engineered, heat-treated steel body with a durable black oxide finish, ensuring reliable operation in virtually any environment. The heat-treated chrome silicone spring and injection-molded polymer follower ensure smooth, reliable feeding, while numbered witness holes allow for visual round counts at a glance. Plus, the removable floor plate allows for easy disassembly for quick maintenance in the field. Plus, this magazine is backed by ProMag's legendary lifetime warranty for lasting service you can depend on. What are you waiting for? Order today! Made in USA.