Constructed of heat-treated steel with a durable black oxide finish, the ProMag® Sig Sauer® P320 / P250 9mm 17-Round Magazine is an affordable, yet reliable aftermarket magazine, designed to deliver consistent field performance and smooth, jam-free operation in virtually any tactical or self-defense environment. The heat-treated chrome silicon spring and injection-molded polymer follower ensure smooth, reliable feeding, while numbered witness holes allow for visual round counts at a glance. A removable floor plate allows for easy disassembly for quick maintenance in the field, while precision-engineered tolerances ensure flawless fit and function for superior reliability. Plus, this centerfire pistol magazine is backed by ProMag's world-renowned lifetime warranty for exceptional quality and lasting field service you can depend on. Order today! Made in USA.