Featuring a durable, yet lightweight DuPont® Zytel™ polymer body, the ProMag® Cobray M11 9mm 32-Round Polymer Magazine is an affordable aftermarket pistol magazine, engineered to deliver factory-like field service at a low, budget-friendly price. The heavy-duty chrome silicon internal spring and injection-molded polymer follower work together to ensure smooth, jam-free operation for maximum reliability and enhanced durability. Plus, the built-in overtravel stop protects against over-insertion for improved reliability. Cobray’s M11 is a popular variant of the Mac-10/Mac-11 automatic pistol, an iconic firearm, and one of the few fully automatic weapons available in substantial numbers on the market today. Engineered to meet or exceed factory standards for perfect fit and function in M11 pistols, these ProMag magazines are a perfect upgrade for your aging automatic pistol. Lifetime warranty. Made in USA.